Unwanted Oscillation Or Radiation Prevention Patents (Class 455/317)
  • Patent number: 10281939
    Abstract: Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (“DC”) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: May 7, 2019
    Assignee: CommScope Technologies LLC
    Inventors: John C. Chamberlain, Michael Guerin, Erik William Lilieholm
  • Patent number: 10141888
    Abstract: A FET based double balanced mixer (DBM) that exhibits good conversion gain and IIP3 values and provides improved linearity and wide bandwidth. In one embodiment, a first balun is configured to receive a local oscillator (LO) signal and generate two balanced LO signals that are coupled to two corresponding opposing nodes of a four-node FET ring. A second balun is configured to pass an RF signal on the unbalanced side. The FET ring includes at least four FETs connected as branches of a ring, with the source of each FET connected to the drain of a next FET in the ring. Each FET is preferably fabricated as, or configured as, a low threshold voltage device having its gate connected to its drain, which causes the FET to operate as a diode, but with the unique characteristic of having close to a zero turn-on voltage.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: November 27, 2018
    Assignee: pSemi Corporation
    Inventor: Daoud Salameh
  • Patent number: 9584164
    Abstract: A mixer-first receiver operates to generate filtering and analog-to-digital conversion concurrently and adaptively, while removing an LNA before a mixer to enable integration with digital baseband circuits. A plurality of switching capacitor arrays are integrated with a hybrid analog-to-digital filtering component. Switching capacitor arrays of the plurality of switching capacitor arrays can be selectively modified to perform both the filtering operation and the conversion operation together. The same switch capacitors of a switching capacitor array can be utilized in one phase of a clock cycle for the filtering and in another phase of the clock cycle for the conversion.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: February 28, 2017
    Assignee: Intel Corporation
    Inventors: Farhana Sheikh, Amy L. Whitcombe, Erkan Alpman, Yanjie Wang, Shreyas Sen
  • Patent number: 9291658
    Abstract: A device can include a radio frequency (RF) signal input, a local oscillator (LO) signal input, a mixer to receive the RF signal and LO signal and translate a frequency of the RF signal based on the LO signal, a strobe pulsing component to provide a timed strobe pulse, and a second mixer to receive a leakage signal, LO signal, and timed strobe pulse, and also to translate a frequency of the leakage signal to baseband. The device can also include a coupling component configured to allow the leakage signal to pass between the mixers. An output signal output can provide a measured value of the leakage signal.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: March 22, 2016
    Assignee: TEKTRONIX, INC.
    Inventors: Donald J. Delzer, Gordon Alan Olsen
  • Patent number: 8977226
    Abstract: A mobile terminal including a transceiver having a plurality of output terminals; a plurality of power amplifier units respectively connected to the plurality of output terminals, and configured to amplify a first or second signal output by the output terminals and to output the amplified first or second signal to a plurality of antennas respectively connected the plurality of power amplifiers; and a receiving module configured to receive a third signal through a receiving antenna disposed to be spaced apart from the plurality of antennas and to output the received third signal to the transceiver. Further, the receiving module includes first and second filters configured to control an intermodulation distortion (IMD) signal included in the third signal due to the output of the first or second signal.
    Type: Grant
    Filed: January 2, 2013
    Date of Patent: March 10, 2015
    Assignee: LG Electronics Inc.
    Inventor: Hoonyong Kim
  • Patent number: 8977222
    Abstract: A circuit for measurement of a phase noise of an oscillator may include the oscillator to generate a first signal having the same oscillation frequency as an instantaneous oscillation frequency of the oscillator. The circuit may include a first circuit that is configured to generate a second signal from the first signal. An instantaneous amplitude of the second signal may be related to the oscillation frequency of the first signal. A second circuit may be configured to integrate the second signal to generate a third signal. The third signal can be a measure of the phase noise of the oscillator. The third signal can be used to cancel some or all of the phase noise of the oscillator.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: March 10, 2015
    Assignee: Broadcom Corporation
    Inventors: Mohyee Mikhemar, David Murphy, Hooman Darabi
  • Patent number: 8958769
    Abstract: A direct conversion receiver including an input stage, a frequency modulated local oscillator, a mixer stage, an output stage, and a DC blocker stage coupled between the mixer stage and the output stage. The input stage is receptive to a frequency modulated transmission having a carrier frequency fc and the frequency modulated local oscillator provides a frequency modulated local oscillator signal. In an embodiment, the frequency modulated local oscillator includes a local oscillator having an output with a frequency approximately equal to fc, a modulation source having a modulation signal output, and a frequency modulator coupled to the outputs of the local oscillator.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: February 17, 2015
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Charles John Razzell
  • Patent number: 8947151
    Abstract: Embodiments of the present invention disclose a frequency mixing circuit and a method for suppressing local oscillation leakage in the frequency mixing circuit, where a mixed input signal and a local oscillation signal are involved, and local oscillation leakage can be effectively reduced by using a frequency mixing circuit whose structure is simpler and is easier to be implemented. The frequency mixing circuit includes a direct current bias circuit, where the direct current bias circuit includes a direct current bias voltage source used for reducing a local oscillation current. The frequency mixing circuit is mainly applied to frequency mixing, and especially to a case where an intermediate frequency signal is mixed with a local oscillation signal to output a radio frequency signal.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: February 3, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Hua Cai, Songlin Shuai, Jia He, Yong Zhang
  • Patent number: 8909187
    Abstract: Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: December 9, 2014
    Assignee: MaxLinear, Inc.
    Inventors: Kishore Seendripu, Raymond Montemayor, Sheng Ye, Glenn Chang, Curtis Ling
  • Publication number: 20140308913
    Abstract: Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.
    Type: Application
    Filed: October 14, 2013
    Publication date: October 16, 2014
    Applicant: PARKERVISION, INC.
    Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Jonathan S. Jensen, Martin R. Johnson, Richard C. Looke, Charley D. Moses, Gregory S. Rawlins, Michael W. Rawlins, Robert T. Short, Jamison L. Young
  • Patent number: 8837332
    Abstract: A method for full duplex communication that includes creating a canceling self interference signal using a passive noise cancellation, and attaining full-duplex simultaneous in time and overlapping in space wireless transmission and reception on same frequency band responsive to the step of creating a canceling self interference signal.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: September 16, 2014
    Assignee: NEC Laboratories America, Inc.
    Inventors: Mohammad A. Khojastepour, Karthikeyan Sundaresan, Sampath Rangarajan
  • Patent number: 8824988
    Abstract: A method for reciprocal-mixing noise cancellation may include receiving a baseband signal down-converted to baseband using a local oscillator (LO). The baseband signal may comprise a wanted signal and a reciprocal mixing noise, which at least partially overlaps the wanted signal and is due to mixing of a blocker signal with a phase noise of the LO. Blocker recovery may be performed on the baseband signal and a blocker estimate signal may be generated from the baseband signal. The phase noise of the LO may be measured and used in generating a phase noise measurement signal. The blocker estimate signal and the phase noise measurement signal may be processed to generate a reconstructed noise signal that may comprise the overlapping reciprocal mixing noise. The reconstructed noise signal may be subtracted from the baseband signal to provide the wanted signal free from to the reciprocal mixing noise.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: September 2, 2014
    Assignee: Broadcom Corporation
    Inventors: Mohyee Mikhemar, David Murphy, Hooman Darabi
  • Patent number: 8818317
    Abstract: The present invention is applied to a frequency converter used for a receiver. The frequency converter according to the present invention includes an LO signal generator (11) that generates an LO signal and outputs the LO signal; and a mixer (10) that multiplies a received signal that has been band-limited in a usable bandwidth of said receiver by the LO signal so as to convert the frequency of the received signal and outputs the resultant signal, wherein said LO signal generator is capable of varying a phase resolution, and said frequency converter is capable of varying a signal gain for each phase value of the LO signal.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: August 26, 2014
    Assignee: NEC Corporation
    Inventor: Masaki Kitsunezuka
  • Publication number: 20140171007
    Abstract: Technique for calibration of a frequency converter for reducing a leakage-based non-direct-current component at an output of the frequency converter.
    Type: Application
    Filed: December 12, 2013
    Publication date: June 19, 2014
    Applicant: Broadcom Corporation
    Inventors: Markus Rudiger NENTWIG, Jouni Kristian KAUKOVUORI
  • Patent number: 8644773
    Abstract: A multiband low noise amplifier (LNA) with parallel resonant feedback includes an amplifier element configured to receive a radio frequency (RF) signal at an RF input and provide an amplified version of the RF signal at an RF output, a resistive feedback circuit coupled between the RF input and the RF output, and a plurality of series-coupled resonant circuits coupled in series with the resistive feedback circuit between the RF input and the RF output of the amplifier element, wherein each of the resonant circuits is configured to operate as an effective short circuit at a frequency other than a resonant frequency and configured to operate as an effective open circuit at the resonant frequency to decouple the resistive feedback from the amplifier element at each resonant frequency.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: February 4, 2014
    Assignee: Skyworks Solutions, Inc.
    Inventor: Haki Cebi
  • Patent number: 8620249
    Abstract: In RF transceivers a method and system for process, voltage, and temperature (PVT) measurement and calibration are provided. A nominal DC offset current may be generated at a nominal temperature and may be based on a calibration voltage. A nominal transconductance parameter may be determined based on the nominal DC offset current and the calibration voltage. The nominal transconductance may be stored and may be utilized to determine temperature and process conditions during operation. In another embodiment, a plurality of DC offset currents may be generated at different temperatures and these generated DC offset currents may be based on a calibration voltage. The calibration voltage may be constant over the range of temperatures. Transconductance parameters may be determined based on the DC offset currents and the calibration voltage. The transconductance parameters may be stored and may be utilized to determine temperature and process conditions during operation.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: December 31, 2013
    Assignee: Broadcom Corporation
    Inventor: Hooman Darabi
  • Patent number: 8620253
    Abstract: An apparatus and method of compensating for a direct voltage offset in a direct conversion receiver of a wireless communications system is provided.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: December 31, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kwang Lee, Byung Ki Han, Si Bum Jun
  • Patent number: 8600332
    Abstract: Electronic devices contain radio-frequency receivers such as direct conversion receivers. A receiver may receive radio-frequency antenna signals from an antenna in an electronic device. The receiver may include notch filters that attenuate signals in the center of the communications channel that is being received by the receiver. An electronic device may include a clock source. The clock source may be used to clock electrical components in the electronic device. During operation, the clock source may produce radio-frequency interference signals at an associated interferer frequency. The potential for the interference signals to disrupt operation of the receiver can be reduced by configuring the electronic device so that the interferer frequency is aligned with the center of the communications channel. The clock source may be adjusted dynamically to accommodate changes in the communications channel.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: December 3, 2013
    Assignee: Apple Inc.
    Inventor: John G. Dorsey
  • Patent number: 8583071
    Abstract: Described are mobile phones that incorporate radiation detectors formed using commonly available semiconductor memories. The radiation detectors require little or no additional hardware over what is available in a conventional phone, and can thus be integrated with little expense or packaging modifications. The low cost supports a broad distribution of detectors. Data collected from constellations of detector-equipped mobile phones can be used to locate mislaid or stolen nuclear materials or other potentially dangerous radiation sources. Phone users can be alerted to radiation dangers in their vicinity, and aggregated phone-specific error data can serve as user-specific dosimeters.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: November 12, 2013
    Assignee: Rambus Inc.
    Inventors: Scott Best, Gary Bronner, Ely Tsern
  • Patent number: 8583049
    Abstract: Techniques are disclosed for optimization of RF converters. The techniques can be employed, for instance, in RF converters implemented in semiconductor materials (system-on-chip, or chip set) or with discrete components on a printed circuit board. In any such cases, the RF converter system can be configured with one or more actuators to adjust performance, one or more sensor to assess the performance (e.g., linearity of RF converter) and parameters of interest (e.g., ambient temperature, and a control block for controlling the sensors and actuators. The configuration allows the RF converter to autonomously self-optimize for linearity or other parameters of interest such as gain, noise figure, and dynamic range, across a broad range of variables.
    Type: Grant
    Filed: September 8, 2009
    Date of Patent: November 12, 2013
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Thomas E. Collins, III
  • Patent number: 8559905
    Abstract: Systems, devices and methods are disclosed for suppressing the 2LO frequency spur, output from a mixer. In various exemplary embodiments, a DC bias circuit is electrically connected to provide DC bias to one or more non-linear elements of the mixer. The biasing voltage is used to cause the current-voltage characteristics and/or junction capacitances between non-linear elements to be more symmetric and/or to suppress 2LO leakage currents that form 2LO frequency spurs at the output of the mixer. The non-linear elements may comprise one of: BJT's, diodes, and FET's. The mixer may be one of: a subharmonic mixer; a fundamental resistive mixer; a fundamental subharmonic transconductance mixer; and a fundamental transconductance mixer comprising an anti-parallel diode pair. The system may further be configured to automatically determine an appropriate DC bias voltage level that will improve one of the LO-IF isolation and the LO-RF isolation.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: October 15, 2013
    Assignee: ViaSat, Inc.
    Inventors: Kenneth V. Buer, Gaurav Menon, Ramanamurthy V. Darapu, Dean Muellenberg
  • Patent number: 8552790
    Abstract: A signal converting device includes: a reference signal-mixing circuit arranged to generate a reference mixing output signal according to an input signal, a reference gain, and a reference local oscillating signal; a plurality of auxiliary signal-mixing circuits, each arranged to generate an auxiliary mixing output signal according to the input signal, an auxiliary gain, and an auxiliary local oscillating signal; and a combining circuit arranged to combine the reference mixing output signal and a plurality of the auxiliary mixing output signals to generate an output signal, and at least one of the auxiliary signal-mixing circuits is configured by the corresponding auxiliary gain to compensate phase imbalances between the reference mixing output signal and each of the auxiliary mixing output signals to reduce a power of a harmonic component in the output signal.
    Type: Grant
    Filed: May 8, 2011
    Date of Patent: October 8, 2013
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Huajiang Zhang, Chun Giek Tan
  • Patent number: 8532236
    Abstract: A radio-frequency (RF) apparatus, which may reside in a receiver or transceiver, includes receive-path circuitry. The receive-path circuitry includes a poly-phase filter and a harmonic filter. The poly-phase filter accepts an input signal and generates two output signals. One output signal of the poly-phase filter constitutes an in-phase (I) signal. The other output signal of the poly-phase filter constitutes a quadrature (Q) signal. The a harmonic filter couples to the poly-phase filter. The harmonic filter accepts as input signals the in-phase and quadrature output signals of the poly-phase filter.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: September 10, 2013
    Assignee: Silicon Laboratories Inc.
    Inventor: Donald A. Kerth
  • Patent number: 8503964
    Abstract: A symmetrical, balanced, down-conversion mixer is achieved by the coordinated layout of a balanced Local Oscillator (LO) divider circuit and a balanced Radio Frequency (RF) mixer circuit, such that the LO divider is in the center and the RF mixer is arrayed symmetrically around the LO divider. In particular, the LO divider is partitioned into four portions (e.g., Ip, In, Qp, Qn), which are placed in respective quadrants, defined by orthogonal reference axes through the LO divider center. The RF mixer is similarly partitioned into four corresponding portions, which are placed around the LO divider portions in each quadrant. By integrating the LO divider and RF mixer in the layout of the symmetric, balanced, down-conversion mixer, greater component matching and control of current paths are possible, improving operational quality parameters such as IRR, IP2, and LO feedthrough.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: August 6, 2013
    Assignee: St-Ericsson SA
    Inventors: Sjoerd Martijn Herder, Berend Hendrik Essink, Johannes Petrus Antonius Frambach
  • Patent number: 8489040
    Abstract: A clock generator circuit generates a wanted RF clock signal by using an up-converter, a spurious tone cancellation circuit, a controller, and at least two clock driver/dividers. The spurious tone cancellation circuit includes a tone detection circuit and a tone generation circuit. The up-converter mixes modulation signals with local quadrature RF clock signals to create an up-converted signal having a frequency tone equal to a desired frequency of the wanted RF clock signal. The first clock driver/divider amplifies and clips the up-converted signal into a first-clipped clock signal. The tone detection circuit detects the amplitude and phase of unwanted tones of the first-clipped clock signal in the baseband domain and provides information to the controller, which controls the tone generation circuit to cancel the unwanted tones and create a compensated version of first-clipped clock signal.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: July 16, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Fenghao Mu
  • Patent number: 8467762
    Abstract: According to an embodiment, a frequency converting device is provided with a duty adjusting unit that generates a 1/N local signal, which is a local signal with a duty ratio of 1/N, when N is an integral number not smaller than 3 and an N-th high-frequency component included in the local signal is a target of inhibition. Further, this is provided with a mixer that outputs difference or sum between/of the 1/N local signal and an input signal.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: June 18, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hideyuki Kokatsu
  • Publication number: 20130122846
    Abstract: Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.
    Type: Application
    Filed: July 16, 2012
    Publication date: May 16, 2013
    Applicant: ParkerVision, Inc.
    Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Jonathan S. Jensen, Martin R. Johnson, JR., Richard C. Looke, Charley D. Moses, JR., Gregory S. Rawlins, Michael W. Rawlins, Robert T. Short, Jamison L. Young
  • Publication number: 20130122847
    Abstract: Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.
    Type: Application
    Filed: January 7, 2013
    Publication date: May 16, 2013
    Inventors: Kishore Seendripu, Raymond Montemayor, Sheng Ye, Glenn Chang, Curtis Ling
  • Patent number: 8422975
    Abstract: Disclosed are circuits, techniques and methods for removing one or more harmonics from a waveform that has been mixed with a local oscillator. In one particular example, such a waveform may also be mixed with a second local oscillator at a different frequency and combined with the first mixed waveform to suppress and/or substantially remove the one or more harmonics.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: April 16, 2013
    Assignee: QUALCOMM, Incorporated
    Inventors: Manas Behera, Junxiong Deng
  • Patent number: 8406707
    Abstract: Various embodiments of systems and methods for generating local oscillator (LO) signals for a harmonic rejection mixer are provided. One embodiment is a system for generating local oscillator (LO) signals for a harmonic rejection mixer. One such system comprises a local oscillator, a divide-by-N frequency divider, a divide-by-three frequency divider, and a harmonic rejection mixer. The local oscillator is configured to provide a reference frequency signal. The divide-by-N frequency divider is configured to divide the reference frequency signal by a value N and provide an output signal. The divide-by-three frequency divider is configured to receive the output signal of the divide-by-N frequency divider and divide the output signal into three phase-offset signals. The harmonic rejection mixer is configured to receive the three phase-offset signals and eliminate third frequency harmonics.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: March 26, 2013
    Assignee: Skyworks Solutions, Inc.
    Inventors: Rajasekhar Pullela, Dmitriy Rozenblit, Hamid Firouzkouhi
  • Patent number: 8380156
    Abstract: A mobile wireless communications device includes a circuit board carried by a housing. A microprocessor, RF transceiver and circuitry are carried by the circuit board and operative with each other. Clock buffer circuitry is carried by the circuit board and connected to the RF transceiver and circuitry and microprocessor for isolating a clock signal from the noise of the microprocessor and allowing greater isolation for the RF transceiver from RF circuitry.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: February 19, 2013
    Assignee: Research In Motion Limited
    Inventors: Lizhong Zhu, Robert Grant
  • Patent number: 8374570
    Abstract: Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: February 12, 2013
    Assignee: MaxLinear, Inc.
    Inventors: Kishore Seendripu, Raymond Montemayor, Sheng Ye, Glenn Chang, Curtis Ling
  • Patent number: 8374569
    Abstract: Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: February 12, 2013
    Assignee: MaxLinear, Inc.
    Inventors: Kishore Seendripu, Raymond Montemayor, Sheng Ye, Glenn Chang, Curtis Ling
  • Patent number: 8374552
    Abstract: Testing a plurality of communication devices. A plurality of signals may be received from the plurality of communication devices. The plurality of signals may include a signal from each of the plurality of communication devices, where a first subset of the plurality of signals has a different frequency than a second subset of the plurality of signals. The received signals may be combined into a combined signal. The combined signal may be downconverted to a combined signal, e.g., by mixing the combined signal with an output from at least one local oscillator. The downconverting may generate a plurality of lower frequency signals, each corresponding to one of the plurality of received signals. Testing may be performed on each of the plurality of lower frequency signals.
    Type: Grant
    Filed: September 22, 2009
    Date of Patent: February 12, 2013
    Assignee: National Instruments Corporation
    Inventors: Craig E. Rupp, Richard Henry Mace Keene
  • Patent number: 8374568
    Abstract: Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: February 12, 2013
    Assignee: MaxLinear, Inc.
    Inventors: Kishore Seendripu, Raymond Montemayor, Sheng Ye, Glenn Chang, Curtis Ling
  • Patent number: 8285240
    Abstract: Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: October 9, 2012
    Assignee: MaxLinear, Inc.
    Inventors: Kishore Seendripu, Raymond Montemayor, Sheng Ye, Glenn Chang, Curtis Ling
  • Publication number: 20120252374
    Abstract: The present disclosure generally relates to the field of receiver structures in radio communication systems and more specifically to passive mixers in the receiver structure and to a technique for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency.
    Type: Application
    Filed: October 23, 2009
    Publication date: October 4, 2012
    Inventors: Sven Mattisson, Pietro Andreani, Daniele Mastantuono
  • Patent number: 8280314
    Abstract: A method for compensating a transceiver for impairments includes transmitting a plurality of partial bandwidth training signals using a transmitter. A plurality of response signals of a receiver having a bandwidth and exhibiting receiver impairments is captured. Each response signal is associated with one of the partial bandwidth training signals. Each of the partial bandwidth training signals is associated with a portion of the receiver bandwidth. A plurality of partial compensation filters is generated based on the plurality of response signals. Each partial compensation filter is associated with one of the response signals. The partial compensation filters are combined to configure a receiver compensation filter operable to compensate for the receiver impairments.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: October 2, 2012
    Assignee: Alcatel Lucent
    Inventors: Michael Steven Heutmaker, Walter Honcharenko
  • Patent number: 8260227
    Abstract: A direct conversion receiver and a DC offset cancellation method are provided. An RF module receives a transmission signal to generate an RF signal. A mixer converts the RF signal to a mixer output comprising baseband and imaginary parts. A filter module filters out the imaginary part of the mixer output and adjusts gain of the baseband part to generate a baseband signal. A calibrator performs a calibration to determine a mismatch value of the mixer. A static DC offset canceller provides a constant offset compensation according to the mismatch value; wherein the mismatch value is used to minimize component mismatching effects of the mixer.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: September 4, 2012
    Assignee: Mediatek Inc.
    Inventor: Chinq-Shiun Chiu
  • Patent number: 8165538
    Abstract: Various embodiments of systems and methods for generating local oscillator (LO) signals for a harmonic rejection mixer are provided. One embodiment is a system for generating local oscillator (LO) signals for a harmonic rejection mixer. One such system comprises a local oscillator, a divide-by-N frequency divider, a divide-by-three frequency divider, and a harmonic rejection mixer. The local oscillator is configured to provide a reference frequency signal. The divide-by-N frequency divider is configured to divide the reference frequency signal by a value N and provide an output signal. The divide-by-three frequency divider is configured to receive the output signal of the divide-by-N frequency divider and divide the output signal into three phase-offset signals. The harmonic rejection mixer is configured to receive the three phase-offset signals and eliminate third frequency harmonics.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: April 24, 2012
    Assignee: Skyworks Solutions, Inc.
    Inventors: Rajasekhar Pullela, Dmitriy Rozenblit, Hamid Firouzkouhi
  • Patent number: 8121575
    Abstract: A modulated intermediate frequency receiver is shown having a low noise amplifier for receiving a radio frequency signal and a modulation source for generating a modulation signal. A local oscillator generates a modulated local oscillator signal in response to the modulation signal. A first mixer mixes the output of the low noise amplifier with the output of the local oscillator. The output of the mixer is DC filtered and receive bandwidth filtered before input to a demodulator that generates a demodulated received signal. Further embodiments are shown for a complex receiver and having phase or frequency modulation compensation.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: February 21, 2012
    Assignee: Silicon Laboratories Inc.
    Inventor: Hendricus De Ruijter
  • Patent number: 8116716
    Abstract: A mobile wireless communications device includes a circuit board carried by a housing. A microprocessor, RF transceiver and circuitry are carried by the circuit board and operative with each other. Clock buffer circuitry is carried by the circuit board and connected to the RF transceiver and circuitry and microprocessor for isolating a clock signal from the noise of the microprocessor and allowing greater isolation for the RF transceiver from RF circuitry.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: February 14, 2012
    Assignee: Research In Motion Limited
    Inventors: Lizhong Zhu, Robert Grant
  • Patent number: 8064869
    Abstract: The present invention discloses a mixer comprising with an input stage (100) for receiving and amplifying input signals (VINP, VINN) and an output stage (300) for outputting output signals (Voutp, Voutn). A switching stage (200) is coupled between the input stage (100) and the output stage (300), the switching stage (200) mixing the amplified input signals with a local oscillator signal (vlop, vlon) to produce the output signals (Voutp, Voutn) at the output stage (300). An RC circuit (cop, rop; con, ron) is connected to the output stage (300) and adapted to move the pole of the output signals.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: November 22, 2011
    Assignee: Synopsys, Inc.
    Inventor: Ricardo dos Santos Reis
  • Patent number: 8045950
    Abstract: A mixing circuit is provided that includes a charge circuit, an oscillating circuit inlet step which is connected to a circuit which feeds an oscillating signal, and a signal inlet step. The oscillating circuit inlet step comprises at least two bipolar-transistors and the emitters thereof are connected to a constant potential which is independent from the oscillating signal. The mixing circuit is used, preferably, in a base station or a mobile radio device of a cellular radio network.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: October 25, 2011
    Assignee: Atmel Corporation
    Inventor: Udo Karthaus
  • Patent number: 8027655
    Abstract: A receiver apparatus for tracking and rejecting a Transmit (Tx) signal in a wireless communication system and an operation method thereof are provided. The receiver apparatus includes a controller for receiving channel frequency information of the Tx signal and for controlling an operation for tracking and rejecting a frequency of the Tx signal; a phase locked loop for generating an oscillation frequency by generating a control voltage according to the channel frequency information of the Tx signal under the control of the controller and for filtering a signal corresponding to the oscillation frequency among signals input to a low noise amplifier; and the low noise amplifier for amplifying power while minimizing noise of a signal filtered by the phase locked loop.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: September 27, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hee-Hyun Lee, Hoon-Tae Kim, Jong-Won Choi
  • Patent number: 8023922
    Abstract: Receivers (5) for simultaneously receiving different radio frequency signals according to different standards are provided with first frequency translating stages (1) for converting the radio frequency signals into first intermediate frequency signals and second frequency translating stages (2) for converting the first intermediate frequency signals into second intermediate frequency signals and processing stages (3) for retrieving first information from the first intermediate frequency signals and second information from the second intermediate signals. As a result, such receivers (5) have relatively low power consumption. The first frequency translating stages (1) comprise first oscillators (19) and first mixers (11) and further first mixers (12). The second frequency translating stages (2) comprise second oscillators (29) and second mixers (21) and further second mixers (22) and third mixers (23) and further third mixers (24).
    Type: Grant
    Filed: February 6, 2006
    Date of Patent: September 20, 2011
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Paul Van Zeijl, Neil Bird
  • Patent number: 8010074
    Abstract: A balanced mixer circuit (300, 400, 500, 600, 700 and 800) in a baseband receiver (202) includes an oscillator circuit (212), a mixer (214 and 215), a digital-to-analog converter (258 and 259) and a digital signal processor (250). The mixer includes CMOS devices (301, 302, 303 and 304). In response to differential outputs from the mixer, the digital signal processor controls the digital-to-analog converter to output bias voltages for the gate of at least one of the CMOS devices of the mixer to compensate for imbalance in the differential output of the mixer that may be caused by mismatch among two or more CMOS devices of the mixer or caused by other reasons, in order to increase second order intercept point of the mixer.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: August 30, 2011
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Daniel L. Kaczman, Lawrence E. Connell, Joseph P. Golat, Manish N. Shah
  • Patent number: 7991368
    Abstract: A frequency conversion apparatus includes a frequency generation circuit, which is based on a first semiconductor material having a first elemental composition and is coupled to generate one or more Local Oscillator (LO) signals. The apparatus further includes a conversion circuit, which is based on a second semiconductor material having a second elemental composition different from the first elemental composition. The conversion circuit is coupled to accept an input signal in a first frequency range and to convert the input signal to an output signal in a second frequency range by mixing the input signal with the one or more LO signals.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: August 2, 2011
    Assignee: Provigent Ltd
    Inventors: Zeev Rubin, Amir Eliaz
  • Patent number: 7986754
    Abstract: An apparatus including a first circuit, a second circuit, a third circuit, and a fourth circuit. The first circuit may be configured to generate a demodulated signal in response to a modulated signal and a seed value selected in response to a first control signal. The second circuit may be configured to generate a second control signal in response to the demodulated signal. The third circuit may be configured to generate the first control signal in response to the second control signal, a compensation signal, and the first control signal, where generation of the first control signal includes adding the second control signal, the compensation signal, and a latched version of the first control signal. Generation of the latched version of the first control signal may include sampling the first control signal in response to a clock signal. The compensation signal may compensate for variation in the clock signal.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: July 26, 2011
    Assignee: LSI Corporation
    Inventor: Dean L. Raby
  • Patent number: 7979044
    Abstract: Methods and systems for wireless communication are disclosed and may include generating first and second signals by band-limiting a received wireless signal in two frequency ranges utilizing programmable bandpass filters. The first and second signals may be undersampled utilizing a clock signal. A delay of the second signal may be coarse-tuned by delaying the undersampling clock signal and may be fine-tuned by delaying the undersampled second signal utilizing a programmable delay line. The delayed, undersampled second signal may be subtracted from the undersampled first signal. A center frequency of the first range may be configured to a desired signal frequency, and a center frequency of the second range may be configured to a blocker signal frequency. The delay line may include an array of CMOS inverters, and may be fine-tuned utilizing programmable capacitors. The bandpass filters may include one or more coplanar waveguide or microstrip bandpass filters.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: July 12, 2011
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza Rofougaran, Maryam Rofougaran