Phase Locked Loop Patents (Class 342/103)
  • Patent number: 11009598
    Abstract: The invention relates to a radar method for determining the angular position, the location, and/or the velocity, in particular the vectorial velocity, of a target, wherein a first transceiver unit and at least one second transceiver unit, which is spatially separated in particular from the first transceiver unit, are not synchronized, but a measurement beginning of the first transceiver unit and the second transceiver unit is triggered in a wireless or wired manner with a chronological deviation ?tn, wherein measurements of the transceiver units are coherently processed.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: May 18, 2021
    Assignee: Symeo GmbH
    Inventors: Yassen Dobrev, Peter Gulden, Mark Christmann, Martin Vossiek, Michael Gottinger
  • Patent number: 10860818
    Abstract: A communication apparatus includes an antenna, a detecting section, and a determining section. The antenna receives a radio wave transmitted from a wireless tag. The detecting section detects a phase of the radio wave. The determining section determines that the wireless tag is present outside a predetermined range if a phase difference between a phase measured if a relative position of the antenna with respect to the wireless tag is a first position within a first range and a phase measured if the relative position is a second position within the first range is smaller than a threshold or if a phase difference between a phase measured if the relative position is a third position within a second range different from the first range and a phase measured if the relative position is a fourth position within the second range is smaller than the threshold.
    Type: Grant
    Filed: May 20, 2019
    Date of Patent: December 8, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Sadatoshi Oishi
  • Patent number: 10693580
    Abstract: Systems and methods to synchronize wireless device nodes in the presence of a FMCW radio altimeter are provided.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: June 23, 2020
    Assignee: Honeywell International Inc.
    Inventors: Steven L. Timm, Kelly P. Muldoon, Michael R. Franceschini
  • Patent number: 10591590
    Abstract: A control algorithm for wireless sensor to estimate and calculate environmental parameters. The control algorithm comprises a method to calculate the distant between an approaching object to wireless sensor receive antenna by measuring the travelling time between completion of transmission of transmit signal at the transmit antenna and completion of reception of the reflected transmit signal at the receive antenna, a method of calculating the approaching speed of an object to wireless sensor receive antenna by using multiple distance measurements, and a method to calculate impact force from an approaching object based on estimated mass of the object and deceleration of its speed.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: March 17, 2020
    Assignee: Kiomars Anvari
    Inventor: Kiomars Anvari
  • Patent number: 10177873
    Abstract: A radio frequency (RF) receiver, for example a satellite positioning system receiver, can be configured to use a single phase locked loop for generating an oscillator signal to perform downconversion of signals in two different frequency bands using two or more local oscillators. A first RF signal portion includes a first signal band and undergoes double downconversion using a first mixer and a second mixer, while a second RF signal portion includes a second signal band and undergoes single downconversion using a single mixer. A controller is configured to determine a first oscillator divider value and a second oscillator divider value to avoid a jammer frequency and frequency dividers are used to generate the two or more local oscillators.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: January 8, 2019
    Assignee: Qualcomm Incorporated
    Inventors: Yi Zeng, Hong Sun Kim, Cheng-Han Wang
  • Patent number: 10118480
    Abstract: A grill shutter module includes a radar unit which radiates radio waves toward a front, a rotatable flap disposed on a side of the radar unit, an actuator disposed behind the radar unit, and a power transmission part configured to connect the actuator and the flap to transmit power from the actuator to the flap.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: November 6, 2018
    Assignee: FALTEC CO., LTD.
    Inventor: Takeshi Yasui
  • Patent number: 10097188
    Abstract: A system and method for system, method and apparatus for phase hits and microphonics cancellation. In addition to a first RF synthesizer source, a device also includes a second stable reference signal source that operates at a lower frequency as compared to the RF synthesizer source. The second stable reference signal source is selected with good phase noise characteristics and can be used to correct phase error events.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: October 9, 2018
    Assignee: MAXLINEAR ASIA SINGAPORE PTE LTD
    Inventors: Igal Yehuda Kushnir, Ido Mordechai Bettesh, Yaacov Sturkovich
  • Patent number: 10048354
    Abstract: The disclosure provides a radar apparatus. The radar apparatus includes a transmit unit that generates a first signal in response to a reference clock and a feedback clock. The first signal is scattered by one or more obstacles to generate a second signal. A receive unit receives the second signal and generates N samples corresponding to the second signal. N is an integer. A conditioning circuit is coupled to the transmit unit and the receive unit. The conditioning circuit receives the N samples corresponding to the second signal, and generates N new samples using an error between the feedback clock and the reference clock.
    Type: Grant
    Filed: August 13, 2015
    Date of Patent: August 14, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sachin Bharadwaj, Karthik Subburaj
  • Patent number: 10033111
    Abstract: A wideband antenna includes a plurality of radiating elements arranged in an array and a feed network. The feed network includes at least one frequency dependent power divider for varying the amplitude of a signal provided to at least two of the plurality of radiating elements as a function of a frequency of a signal. The feed network may further comprise a plurality of inputs and the antenna may produce a plurality of beams. The frequency dependent divider may comprise a power divider having a first output and a second output, a 90° hybrid, having a first input coupled to the first output of the power divider, and a second input, and a delay line, coupled between the second output of the power divider and the second input of the 90° hybrid.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: July 24, 2018
    Assignee: CommScope Technologies LLC
    Inventors: Igor E. Timofeev, Gangyi Deng
  • Patent number: 10024959
    Abstract: There are provided a tracking processing device and a tracking processing method with which time lag from the receipt of a command to track a target until the movement state of this target is estimated more accurately can be reduced, the calculation burden can be reduced, and the memory capacity can be reduced. A tracking processing device 3 has an echo detector 9 and a tracking processor 11. The tracking processor 11 includes a characteristic information memory 41. The echo detector 9 detects information on tracking representative points P for one or more targets. The characteristic information memory 41 stores the information on the tracking representative points P at a plurality of time-points. The tracking processor 11 tracks the tracking target selected from among a number of targets. The tracking processor 11 uses information stored in a characteristic information memory 41 to estimate an estimated speed vector V5(n) for this tracking target at the start of tracking of the tracking target.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: July 17, 2018
    Assignee: FURUNO ELECTRIC COMPANY LIMITED
    Inventor: Kazuya Nakagawa
  • Patent number: 10006987
    Abstract: A radar device comprises at least one transmitter unit for transmitting a radar signal, at least one receiver unit for receiving a reflected radar signal, and a phase shift unit for producing a phase shift in the frequency modulated radar signal in response to a phase shift signal. The receiver unit comprises at least one filter unit for filtering the received signal and is arranged for resetting the filter unit in response to said phase shift signal, so as to avoid saturation of the filter unit due to the phase shift.
    Type: Grant
    Filed: March 9, 2015
    Date of Patent: June 26, 2018
    Assignee: NXP USA, Inc.
    Inventors: Cristian Pavao-Moreira, Dominique Delbecq, Birama Goumballa
  • Patent number: 9807571
    Abstract: A very high frequency (VHF) transceiver can include an amplitude and phase shift keying (APSK) modulator configured to modulate signals for transmission across a first VHF channel of a plurality of VHF channels used to communicate between or among aircraft and one or more ground stations. Each of the VHF channels can have a bandwidth of at least 8.33 kilo Hertz (kHz) with a data rate per Hertz (Hz) greater than or equal to 3 bits per second per Hz (bps/Hz). The VHF transceiver can include a power amplifier configured to amplify the modulated signals prior to the transmission. The VHF transceiver can include a linearity controller configured to control linearity of the power amplifier according to at least one of a Cartesian feedback amplifier linearization, pre-distortion amplifier linearization or feedforward amplifier linearization to mitigate nonlinear distortion associated with signals output by the power amplifier.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: October 31, 2017
    Assignee: ROCKWELL COLLINS, INC.
    Inventors: Scott F. Bauler, William T. Greenleaf, Neil J. Earnhardt, Joel M. Wichgers
  • Patent number: 9733345
    Abstract: A system, device and method that enables units to communicate with each other and point to each other's location without requiring line-of-sight to satellites or any other infrastructure. Further, the system, device and method are able to operate outdoors as well as indoors and overcome multipath interference in a deterministic algorithm, while providing bearings at three dimensions, not only location but actual direction.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: August 15, 2017
    Assignee: Iseeloc, Inc.
    Inventors: Avi Zohar, Sharon Zohar
  • Patent number: 9647648
    Abstract: A signal processor includes an amplifier that amplifies a control signal which is input into the amplifier to output an amplified control signal; and a controller that performs predetermined control based on the amplified control signal. When the control signal is not input into the amplifier, the amplifier amplifies a voltage signal input from a power source for driving the amplifier.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: May 9, 2017
    Assignee: FUJITSU TEN LIMITED
    Inventors: Kenta Iwai, Daisuke Enomoto, Kazuhiro Komatsu
  • Patent number: 9635802
    Abstract: A motor drives a seeding system. A sensor senses a characteristic of the motor and a motor jam is detected based on the sensed characteristic. The motor is momentarily reversed, when a jam is detected.
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: May 2, 2017
    Assignee: Deere & Company
    Inventors: Gerald E. Rains, Michael E. Frasier
  • Patent number: 9582695
    Abstract: The present invention relates to a polychronous wave propagation system that is based on relative timing between two or more propagated waves through a wave propagation medium. The relative timing may be associated with interference patterns of energy between the propagated waves. Operational behavior of the polychronous wave propagation system is based on the relative timing of the propagated waves and distances between initiators that transmit the propagated waves and responders that receive the propagated waves. The operational behavior may include arithmetical computations, memory storage, Boolean functions, frequency-based computations, or the like. The polychronous wave propagation system relies on time delays between the propagated waves that result from propagation velocities of the propagated waves through the wave propagation medium. By incorporating the time delays into the system, operational capacity may be greatly enhanced.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: February 28, 2017
    Assignee: New York University
    Inventors: Frank C. Hoppensteadt, Varun Narendra, Eugene M. Izhikevich
  • Patent number: 9453906
    Abstract: This invention describes circuits and methods which can allow multiple radar receiver chips to be adjusted to have very low phase offset between them. Multiple receiver chips are used in frequency-modulated carrier-wave (FMCW) radar systems for beamforming to enable angle-of-arrival measurements. FMCW radar systems are widely used in collision-avoidance and adaptive cruise control systems in vehicles, which today are operating in the 76-81 GHz frequency band. In a multi-receiver system, each receive element must have a well-controlled phase response which can be calibrated over process, voltage, and temperature. Without calibration, phase offsets can result in erroneous beamforming receiver measurements. The inventive circuit provides a technique to adjust the phase of multiple receivers across multiple chips using a single local oscillator reference and built-in-test circuitry which consist of phase shifters, a multi-frequency nonlinear phase detection circuit, and power coupling circuits.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: September 27, 2016
    Assignees: North Carolina State University, Asahi Kasei Microdevices Corporation
    Inventors: Brian Floyd, Takeji Fujibayashi, Seiji Takeuchi
  • Patent number: 9417315
    Abstract: A transmitter front end circuit is described. The transmitter front end circuit is provided with a radar transmitter port, a radar receiver port, a radar amplifier, a coupler, a radar antenna input and a signal director. The radar amplifier has a low power side receiving a transmit signal having a transmit waveform modulated onto a carrier frequency from the radar transmitter port, and a high power side outputting an amplified transmit waveform suitable for transmission to a radar antenna. The coupler is coupled to the high power side of the radar amplifier to sample the amplified transmit waveform. The radar antenna input is configured to receive return signals from a radar antenna. And, the signal director selectively directs the sample of the amplified transmit waveform and the return signals to the radar receiver port.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: August 16, 2016
    Assignee: The Board of Regents of the University of Oklahoma
    Inventors: Robert Dean Palmer, Redmond Clay Kelley, Boon Leng Cheong, Yan Zhang
  • Patent number: 9245447
    Abstract: The invention relates to a method for the communication signal-based position determination of objects in road traffic, in which at least one data transporting communication signal is wirelessly transmitted from at least one sender (217, 218, 219, 220, 221, 34) and is reflected at least proportionally as a reflection signal on at least one object (211, 212, 213, 214, 215, 216, 35), wherein the at least one communication signal and the reflection signal are received by a receiver (222, 33), and wherein the of at least one sender (217, 218, 219, 220, 221, 34). The method is characterized in that a propagation time difference of the communication signal and the reflection signal is determined by the received (222, 33). The invention further relates to a corresponding device (100) and to the use thereof.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: January 26, 2016
    Assignee: CONTINENTAL TEVES AG & CO. OHG
    Inventors: Sighard Schräbler, Ulrich Stählin, Marc Menzel
  • Patent number: 8937572
    Abstract: A signal generator of an embodiment has an oscillator to generate an oscillation signal controlled in frequency by an analog control signal; a digital phase detector; a first differentiator; and a comparator outputting digital frequency error information. The generator includes a second differentiator differentiating the frequency setting code to generate a gain value and an inverse number of the gain value; a first multiplier multiplying the digital frequency error information by the gain value, a low-pass filter removing a high frequency component in a multiplication result, and a second multiplier multiplying an output of the low-pass filter by the inverse number. The generator includes a D/A converter converting a multiplication result into analog frequency error information, and an integrator converting the analog frequency error information into analog phase error information to output the analog phase error information as the analog control signal.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: January 20, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuka Kobayashi, Hiroki Sakurai
  • Patent number: 8903030
    Abstract: A clock data recovery circuit (CDR) extracts bit data values from a serial bit stream without reference to a transmitter clock. A controllable oscillator produces a regenerated clock signal controlled to match the frequency and phase of transitions between bits and the serial data is sampled at an optimal phase. A phase detector generates early-or-late indication bits for clock versus data transition times, which are accumulated and applied to a second order feedback control with two distinct feedback paths for frequency and phase, combined for correcting the controllable oscillator, selecting a sub-phase and/or determining an optimal phase at which the bit stream data values are sampled. The second order filter is operated at distinct rates such that the phase correction has a latency as short as one clock cycle and the frequency correction latency occurs over plural cycles.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: December 2, 2014
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventors: Tao Wen Chung, Chan-Hong Chern, Ming-Chieh Huang, Chih-Chang Lin, Yuwen Swei, Tsung-Ching Huang
  • Patent number: 8866667
    Abstract: One embodiment is directed towards a FMCW radar having a single antenna. The radar includes a transmit path having a voltage controlled oscillator controlled by a phase-locked loop, and the phase-locked loop includes a fractional-n synthesizer configured to implement a FMCW ramp waveform that ramps from a starting frequency to an ending frequency and upon reaching the ending frequency returns to the starting frequency to ramp again. The radar also includes a delay path coupled between a coupler on the transmit path and a mixer in a receive path. The delay path is configured to delay a local oscillator reference signal from the transmit path such that the propagation time of the local oscillator reference signal from the coupler to the mixer through the delay path is between the propagation time of signal reflected off the antenna and the propagation time of a leakage signal through a circulator.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: October 21, 2014
    Assignee: Honeywell International Inc.
    Inventor: David C. Vacanti
  • Patent number: 8816878
    Abstract: There is provided a parking assist apparatus capable of allowing an automatic steering control to be started smoothly, without requiring any special operation after confirmation of a parking target location. The parking assist apparatus includes a parking target position setting section for setting a parking target position, a guiding path calculating section for calculating a guiding path to the parking target position, a reporting information outputting section for reporting to the driver upon successful establishment of a guiding path that an automatic steering is now possible, a non-holding state determining section for determining whether there is established a non-holding state of the driver not holding a steering device, and a guiding start determining section configured to allow guiding by the automatic steering to be started, provided the guiding path has been established AND the non-holding state has been realized.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: August 26, 2014
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Jun Kadowaki, Kazuya Watanabe
  • Patent number: 8754806
    Abstract: A pulse radar receiver includes a power splitter configured to split a transmit (TX) trigger signal for generating a TX pulse, a phase-locked loop (PLL) configured to receive a division ratio and the TX trigger signal split by the power splitter, and generate a sampling frequency, and a sampler configured to sample a reflected wave received through an RX antenna, according to the sampling frequency generated by the PLL. Accordingly, it is possible to provide a high distance resolution by generating a sampling frequency with a difference from a TX pulse to sample a reflected wave received through an RX antenna. Thus, it is possible to overcome a limitation in the distance resolution due to the pulse width and to measure a minute movement at a short distance. Therefore, the pulse radar receiver is applicable to high range resolution radar applications such as a living body measuring radar.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: June 17, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Pil Jae Park, Seong Do Kim, Sung Chul Woo, Hyun Kyu Yu
  • Patent number: 8711032
    Abstract: A radio frequency ranging system is grounded in establishing and maintaining phase and frequency coherency of signals received by a slave unit from a master unit and retransmitted to the master unit by the slave unit. For a preferred embodiment of the invention, coherency is established through the use of a delta-sigma phase-lock loop, and maintained through the use, on both master and slave units, of thermally-insulated reference oscillators, which are highly stable over the short periods of time during which communications occur. A phase relationship counter is employed to keep track of the fractional time frames of the phase-lock loop as a function of the reference oscillator, thereby providing absolute phase information for an incoming burst on any channel, thereby enabling the system to almost instantaneously establish or reestablish the phase relationship of the local oscillator so that it synchronized with the reference oscillator.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: April 29, 2014
    Assignee: Greina Technologies, Inc.
    Inventor: Daniel Joseph Lee
  • Patent number: 8712360
    Abstract: A system includes a first clock module, a global positioning system (GPS) module, a phase-locked loop (PLL) module, a cellular transceiver, and a baseband module. The first clock module generates a first clock reference. The GPS module operates in response to the first clock reference. The WLAN module operates in response to the first clock reference. The PLL module generates a second clock reference by performing automatic frequency correction (AFC) on the first clock reference in response to an AFC signal. The cellular transceiver receives radio frequency signals from a wireless medium and generates baseband signals in response to the received radio frequency signals. The baseband module receives the baseband signals, operates in response to a selected one of the first clock reference and the second clock reference, and generates the AFC signal in response to the baseband signals.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: April 29, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Gregory Uehara, Alexander Zaslavsky, Brian T. Brunn
  • Patent number: 8654006
    Abstract: An integrated circuit comprises frequency generation circuitry for controlling a frequency source for an automotive radar system. The frequency generation circuitry comprises a Phase Locked Loop (PLL) arranged to generate a control signal for controlling the frequency source, a fractional-N divider located within a feedback loop of the PLL, and frequency pattern control logic operably coupled to the fractional-N divider and arranged to control the fractional-N divider, by way of a frequency control signal, such that the PLL generates a Frequency Modulated Continuous Wave (FMCW) control signal.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: February 18, 2014
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Christophe Landez, Hugues Beaulaton, Thierry Cassagnes, Stephane Colomines, Robert G. Gach, Akbar Ghazinour, Hao Li, Gilles Montoriol, Didier Salle, Pierre Savary
  • Patent number: 8552902
    Abstract: An imaging receiver includes a low noise amplifier (LNA) module to receive and amplify the radio-frequency (RF) input signal; one or more switches configured to selectively pass RF input to one or more of the power detector circuits; one or more power detector circuits coupled to the switches to generate output voltages proportional to associated powers at their input ports; one or more reference circuits to provide reference signals to the switches; and one or more integrator circuits to integrate the output voltages of the power detector circuits.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: October 8, 2013
    Assignee: Sabertek
    Inventors: Farbod Behbahani, Vipul Jain
  • Patent number: 8532600
    Abstract: A system includes a first clock module, a global positioning system (GPS) module, a phase-locked loop (PLL) module, a cellular transceiver, and a baseband module. The first clock module generates a first clock reference. The GPS module operates in response to the first clock reference. The WLAN module operates in response to the first clock reference. The PLL module generates a second clock reference by performing automatic frequency correction (AFC) on the first clock reference in response to an AFC signal. The cellular transceiver receives radio frequency signals from a wireless medium and generates baseband signals in response to the received radio frequency signals. The baseband module receives the baseband signals, operates in response to a selected one of the first clock reference and the second clock reference, and generates the AFC signal in response to the baseband signals.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: September 10, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Gregory Uehara, Alexander Zaslavsky, Brian Brunn
  • Patent number: 8494085
    Abstract: Aspects of a method and system for bandwidth calibration for a phase locked loop are presented. Aspects of the method may include generating one or more carrier signals based on one or more corresponding calibration signals. A pre-distortion function may be computed based on the generated one or more carrier signals for the phase locked loop circuit. An output radio frequency (RF) synthesized signal generated by the phase locked loop circuit may be modified based on the computed pre-distortion function and a subsequent output RF synthesized signal generated based on the modified output RF synthesized signal.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: July 23, 2013
    Assignee: Broadcom Corporation
    Inventor: Sofoklis Plevridis
  • Patent number: 8433026
    Abstract: A Digital Phase-Locked Loop (DPLL) involves a Time-to-Digital Converter (TDC) that receives a Digitally Controlled Oscillator (DCO) output signal and a reference clock and outputs a first stream of digital values. The TDC is clocked at a high rate. Downsampling circuitry converts the first stream into a second stream. The second stream is supplied to a phase detecting summer of the DPLL such that a control portion of the DPLL can switch at a lower rate to reduce power consumption. The DPLL is therefore referred to as a multi-rate DPLL. A third stream of digital tuning words output by the control portion is upsampled before being supplied to the DCO so that the DCO can be clocked at the higher rate. In a receiver application, no upsampling is performed and the DCO is clocked at the lower rate.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: April 30, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Gary John Ballantyne, Jifeng Geng, Daniel F. Filipovic
  • Patent number: 8416121
    Abstract: A frequency modulation continuous wave (FMCW) system includes a first memory receiving a clock signal and storing voltage digital values of I FMCW signals, a second memory receiving the clock signal and storing the voltage digital values of the Q FMCW signals, a first digital-to-analog converter (DAC) connected to the first memory and receiving the clock signal for converting the voltage digital values of the I FMCW signal to a first analog voltage, a second digital-to-analog converter (DAC) connected to the second memory and receiving the clock signal for converting the voltage digital values of the Q FMCW signal to a second analog voltage, an I low-pass filter connected to the first DAC smoothing the I FMCW signal and a Q low-pass filter connected to the second DAC smoothing the Q FMCW signal.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: April 9, 2013
    Assignee: International Business Machines Corporation
    Inventors: Howard H. Chen, Kai D. Feng, Duixian Liu
  • Patent number: 8363703
    Abstract: A method may include performing a logical exclusive OR and a logical inverse exclusive or on an input reference signal and an output signal to generate an XOR signal and an XNOR signal, respectively. The method may also include generating a switch control signal indicative of whether a first phase of the input reference signal leads or lags a second phase of the output signal. The method may additionally include: (i) transmitting the XOR signal to an output of a switch if the first phase leads the second phase; and (ii) transmitting the XNOR signal to the output of the switch if the first phase lags the second phase. The method may further include generating a phase detector output signal indicative of a phase difference between the second phase based on a signal present on the output of the switch.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: January 29, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Jeffrey D. Ganger, Claudio G. Rey
  • Patent number: 8350750
    Abstract: A distributed time reversal mirror array (DTRMA) system includes a plurality of independent, sparsely distributed time reversal mirrors (TRMs). Each of the TRMs includes an antenna; a transceiver connected to the antenna for transmitting a signal toward a target, for receiving a return, reflected signal from the target, and for retransmitting a time-reversed signal toward the target: means for phase-locking and for maintaining spatial and temporal coherences between the TRMs; and a computer including a machine-readable storage media having programmed instructions stored thereon for computing and generating the time-reversed retransmitted signal, thereby providing a phased array functionality for the DTRMA while minimizing distortion from external sources. The DTRMA is capable of operating in an autonomous, unattended, and passive state, owing to the time-reversal's self-focusing feature. The beam may be sharply focused on the target due to the coherently synthesized extended aperture over the entire array.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: January 8, 2013
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Eung Gi Paek, Joon Y Choe
  • Patent number: 8301098
    Abstract: A system comprises a first clock module configured to generate a first clock reference that is not corrected using automatic frequency correction (AFC). A global position system (GPS) module is configured to receive the first clock reference. An integrated circuit for a cellular transceiver includes a system phase lock loop configured to receive the first clock reference, to perform AFC, and to generate a second clock reference that is AFC corrected.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: October 30, 2012
    Assignee: Marvell World Trade Ltd.
    Inventors: Gregory Uehara, Alexander Zaslavsky, Brian Brunn
  • Patent number: 8275493
    Abstract: A system and method are provided for launching and recovering an unmanned, water-born vehicle (UWBV) from a mother ship. The UWBV mimics the behavior of dolphins and is positioned ahead of the ship in preparation for bow riding. The UWBV uses a guidance system to position and keep in the bow wave. A high-frequency (HF) sonar transceiver array aboard the ship computes and sends course corrections to maintain the UWBV within the bow wave. The frequency range of the HF array can be 100 kHz or higher due to the short distance between the ship and the UWBV. Accordingly, the HF array can have a small aperture allowing for accurate bearing resolution. Course corrections can be sent on a near-continuous basis such that changes in thrust and rudder angle can be minimized to allow for accurate control of the UWBV.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: September 25, 2012
    Inventor: Anthony A. Ruffa
  • Patent number: 8274426
    Abstract: A radio frequency ranging system is grounded in establishing and maintaining phase and frequency coherency of signals received by a slave unit from a master unit and retransmitted to the master unit by the slave unit. For a preferred embodiment of the invention, coherency is established through the use of a delta-sigma phase-lock loop, and maintained through the use, on both master and slave units, of thermally-insulated reference oscillators, which are highly stable over the short periods of time during which communications occur. A phase relationship counter is employed to keep track of the fractional time frames of the phase-lock loop as a function of the reference oscillator, thereby providing absolute phase information for an incoming burst on any channel, thereby enabling the system to almost instantaneously establish or reestablish the phase relationship of the local oscillator so that it synchronized with the reference oscillator.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: September 25, 2012
    Assignee: Greina Technologies, Inc
    Inventor: Daniel Joseph Lee
  • Patent number: 8233578
    Abstract: A phase lock loop frequency synthesizer includes a phase rotator in the feedback path of the PLL. The PLL includes a phase detector, a low pass filter, a charge pump, a voltage controlled oscillator (“VCO”), and a feedback path connecting output of the VCO to the phase detector. The feedback path includes a phase rotator connected to the output of the VCO and to an input of a frequency divider. Coarse frequency control is implemented by adjusting the input reference frequency to the phase detector or by adjusting the divider ratio of the frequency divider. Fine frequency control is achieved by increasing or decreasing the rotation speed of the phase rotator. The phase rotator constantly rotates phase of the VCO output, thereby causing a frequency shift at the output of the phase rotator.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: July 31, 2012
    Assignee: Broadcom Corporation
    Inventors: Chun-Ying Chen, Michael Q. Le, Myles Wakayama
  • Patent number: 8212715
    Abstract: A radar system includes at least two modules, each having a phase detector and a first high-frequency source and each having an antenna output and/or each having one or more antennas. At least two modules include a device for synchronization between the first high-frequency source of a first module of the at least two modules and the first high-frequency source of a second module of the at least two modules of the radar system. The phase detector has a first input for a first reference signal. The phase detector also has a second input for a first loop signal. A module for a radar system has the design of one of the modules of the radar system described above.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: July 3, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Armin Himmelstoss, Joachim Hauk, Elisabeth Hauk, legal representative, Rahel Hauk, legal representative, Manuel Hauk, legal representative, Dirk Steinbuch
  • Patent number: 8213560
    Abstract: Disclosed herein is a phase-locked loop circuit including: a voltage controlled oscillator; a variable frequency divider circuit for frequency-dividing an oscillating signal of the voltage controlled oscillator into a 1/N (N is an integer) frequency; a phase comparator circuit for comparing phases of a frequency-divided signal and a reference signal of a reference frequency with each other; a charge pump circuit for outputting a charge pump current changed in pulse width; a loop filter for being supplied with the charge pump current and outputting a direct-current voltage changed in level; and a control circuit for calculating a value of the charge pump current as a function of the oscillating frequency of the voltage controlled oscillator and a coefficient for setting a phase locked loop band, and setting the value of the charge pump current in the charge pump circuit.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: July 3, 2012
    Assignee: Sony Corporation
    Inventors: Kiyoshi Miura, Michiko Miura, legal representative
  • Publication number: 20120127020
    Abstract: A distributed time reversal mirror array (DTRMA) system includes a plurality of independent, sparsely distributed time reversal mirrors (TRMs). Each of the TRMs includes an antenna; a transceiver connected to the antenna for transmitting a signal toward a target, for receiving a return, reflected signal from the target, and for retransmitting a time-reversed signal toward the target; means for phase-locking and for maintaining spatial and temporal coherences between the TRMs; and a computer including a machine-readable storage media having programmed instructions stored thereon for computing and generating the time-reversed retransmitted signal, thereby providing a phased array functionality for the DTRMA while minimizing distortion from external sources. The DTRMA is capable of operating in an autonomous, unattended, and passive state, owing to the time-reversal's self-focusing feature. The beam may be sharply focused on the target due to the coherently synthesized extended aperture over the entire array.
    Type: Application
    Filed: November 18, 2010
    Publication date: May 24, 2012
    Inventors: Eung Gi Paek, Joon Y. Choe
  • Patent number: 8164511
    Abstract: In order to prevent delays in output of detection results, even when a plurality of frequency modulation methods with different frequency change rates are used, an FM-CW radar device employing frequency modulation with two different frequency change rates, has distance/velocity detection unit for detecting the relative distance or relative velocity of a target object based on beat signals of transmission signals with the same frequency change rate and for detecting the relative distance or relative velocity using beat signals when the frequency change rates are different, and distance/velocity confirmation unit for adding evaluation values for relative distances or relative velocities detected in the detection processing, and for confirming the relative distance or relative velocity based on the evaluation value which has reached a criterion value. As a result, more data can be obtained in one detection cycle, and the same advantageous results as when executing a plurality of detection cycles can be obtained.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: April 24, 2012
    Assignee: Fujitsu Ten Limited
    Inventors: Masayuki Kishida, Hisateru Asanuma, Kohsuke Noda, Tomoya Kawasaki
  • Patent number: 8131224
    Abstract: Phase and gain of a transmit signal are measured at a transmitter by determining a first time delay having a first resolution at a measurement receiver between a reference signal from which the transmit signal is generated and a measured signal derived from the transmit signal by comparing amplitudes of the reference signal and the measured signal. A second time delay having a second resolution finer than the first resolution is determined at the measurement receiver between the reference signal and the measured signal based on the first time delay. The reference signal and the measured signal are time aligned at the measurement receiver based on the second time delay and the phase and gain of the transmit signal are estimated after the reference signal and the measured signal are time aligned.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: March 6, 2012
    Assignee: St-Ericsson SA
    Inventors: Wael A. Al-Qaq, Zhihang Zhang, Nikolaus Klemmer
  • Patent number: 8098193
    Abstract: An ultra wide band (UWB) millimeter (mm) wave radar system includes a signal source having a control input, a GHz signal output and a frequency controlled output. A control loop is coupled between the GHz signal output and the control input including a frequency divider and a digitally controlled PLL that provides a locked output coupled to the control input of the signal source to provide frequency locked output signals that are discrete frequency swept or hopped. A frequency multiplier is coupled to the frequency controlled output of the signal source for outputting a plurality of mm-wave frequencies. An antenna transmits the mm-wave frequencies to a surface to be interrogated and receives reflected mm-wave signals therefrom. A mixer mixes the reflected mm-wave signals and mm-wave frequencies and processing circuitry determines at least one parameter relating to the surface from the mixing output.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: January 17, 2012
    Assignee: Honeywell International Inc.
    Inventors: Bin Sai, Laurent Mauduit
  • Publication number: 20110267217
    Abstract: In an antenna radar system including a short-range function and a long-range function which is situated separately from the short-range function, the short-range function and the long-range function having different antenna apertures, means are provided for mutual cross-polarization of the signals emitted and received using the short-range function and the long-range function, through which the most efficient possible signal-technology decoupling between the short-range function and the long-range function is achieved.
    Type: Application
    Filed: August 10, 2005
    Publication date: November 3, 2011
    Inventors: Juergen Hildebrandt, Joachim Hauk, Martin Reiche
  • Patent number: 8027409
    Abstract: In an exemplary embodiment, noise prediction-based data detection is described with respect to a SERDES (serializer/deserializer) backplane primary channel subject to inter-symbol interference (ISI) noise and added cross-talk noise from other channels. Noise prediction-based data detection combines an added error component from inter-symbol interference (ISI) noise and an added error component from cross-talk noise into an overall noise prediction error term and cancels effects of residual ISI and cross-talk for various components of the exemplary embodiment.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: September 27, 2011
    Assignee: Agere Systems Inc.
    Inventors: Pervez M. Aziz, Mohammad S. Mobin, Gregory W. Sheets
  • Patent number: 7990313
    Abstract: An FMCW radar has a variable frequency microwave signal source for outputting a microwave signal, a frequency divider, a phase-locked loop, a loop filter and a reference signal source. The frequency divider is connected between the output of the variable frequency microwave signal source and an input of the phase-locked loop. The loop filter is connected between the output of the phase-locked loop and the input of the variable frequency microwave signal source. The reference signal source is connected to an additional input of the phase-locked loop. The frequency divider is adjustable, in particular digitally adjustable. A method for operating an FMWC radar includes adjusting a variable frequency microwave signal source by way of a closed-loop control circuit which uses a reference signal of a reference signal source, especially of a quartz oscillator, as the reference value, and a frequency-divided output signal of the microwave signal source as the feedback value.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: August 2, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventors: Martin Nalezinski, Claus Seisenberger
  • Patent number: 7983370
    Abstract: A clock and data recovery circuit including a phase synchronization loop including an oscillator, the oscillation frequency of which is variably controlled, the phase synchronization loop performing phase-synchronization of a clock signal output from the oscillator with an input data signal. The circuit also includes a discriminator circuit, responsive to a clock signal for discrimination, for discriminating the input data signal and outputting the discriminated signal. The circuit further includes a phase detector circuit for detecting the phase difference between an output data signal, discriminated and output by the discriminator circuit, and the input data signal. The circuit also includes a phase shift circuit for shifting the phase of the clock signal, output from the oscillator, based on a comparison result output from the phase detector circuit. The clock signal, which is output from the phase shift circuit, is supplied as the clock signal for discrimination to the discriminator circuit.
    Type: Grant
    Filed: November 26, 2004
    Date of Patent: July 19, 2011
    Assignee: NEC Corporation
    Inventor: Shigeki Wada
  • Patent number: 7953328
    Abstract: An apparatus and a method for a I-Q quadrature modulation transmitter monitor a phase bias between an I branch and a Q branch of the I-Q quadrature modulation transmitter. The I-Q quadrature modulation transmitter includes the I-branch, the Q-branch equipped with a phase bias, and a tap. The apparatus is installed between the tap and the phase bias, and monitors the phase between the I branch and the Q branch which phase is introduced by the phase bias. The apparatus includes the following components: a module squarer, receiving signal from the tap and outputting a module square of the received signal; a multiplier, to multiplying data of the I-branch, data of the Q-branch and the module square to output a multiplied signal; and an averager, averaging the multiplied signal output by the multiplier. The phase between the I branch and the Q branch may be corrected according to monitoring results.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: May 31, 2011
    Assignee: Fujitsu Limited
    Inventors: Zhenning Tao, Jens C. Rasmussen
  • Patent number: 7940667
    Abstract: Delay measurement and delay calibration methods and apparatus are described for use within distributed wireless base stations employing a remote radio head topology. The methods and apparatus are usable in any system that requires accurate delay measurement and/or constant delay through an electronic device. The methods and apparatus for measuring delay embody a highly accurate distributed delay measurement architecture that handles multiple delay paths within distributed wireless base stations employing a remote radio head topology. The method and apparatus are amenable to implementation with current integrated circuit technology. The methods and apparatus for calibrating electronic delay within distributed base stations employing a remote radio head topology are useful for implementing distributed wireless base stations where transmit diversity is desired.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: May 10, 2011
    Assignee: PMC-Sierra US, Inc.
    Inventors: Alan Coady, Zixiong Wang