Triggering Or Pulsing (e.g., Burst Generators) Patents (Class 331/173)
  • Patent number: 9571109
    Abstract: A feedback module for preventing voltage controlled oscillator (VCO) runaway in a phase locked loop (PLL) circuit can include a first, a second, and a third input to receive a first output signal from a PLL circuit, a reference signal, and a first control signal. The feedback module may also include a feedback circuit to generate a second control signal, the second control signal being coupled to an input of the PLL circuit, wherein the feedback circuit generates the second control signal by comparing a number of cycles of the first output signal to a first threshold, and a number of cycles of the reference signal to a second threshold.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: February 14, 2017
    Assignee: International Business Machines Corporation
    Inventors: David M. Friend, James D. Strom, Alan P. Wagstaff
  • Patent number: 9344034
    Abstract: An oscillator and a semiconductor integrated circuit device with an internal oscillator capable of compensating the temperature characteristics even when there is a large parasitic capacitance too large to ignore directly between the output terminals of the oscillator. In an oscillator containing an inductance element L, and a capacitive element C, and an amplifier each coupled in parallel across a first and second terminal, the amplifier amplifies the resonance generated by the inductance element and capacitive element and issues an output from the first terminal and the second terminal, and in which a first resistance element with a larger resistance value than the parasitic resistance of the inductance element between the first terminal and the second terminal, is coupled in serial with the capacitive element between the first terminal and the second terminal.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: May 17, 2016
    Assignee: Renesas Electronics Corporation
    Inventors: Yoichi Iizuka, Yasuo Ikeda, Satoshi Onishi
  • Patent number: 9178357
    Abstract: A power generation and transmission system, including: a wind turbine having an electrical generator (12) producing AC electrical power at a production frequency; a converter connected to the electrical generator (12) and configured to convert the AC electrical power to a transmission frequency below a grid frequency; an insulated transmission cable (18) connected to the converter and disposed at least partly submarine or subterranean; and a synchronous frequency converter (24) remote from the wind turbine and configured to receive the AC electrical power from the insulated transmission cable (18) and to convert it to the grid frequency for supply to a grid.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: November 3, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventor: Robert J. Nelson
  • Patent number: 9007138
    Abstract: An oscillator that includes a first source current leg and first sink current leg to source current and sink current, respectively, during a startup mode of oscillator operation. The oscillator includes a second source current leg and a second sink current leg to source current and sink current, respectively, during a second mode of oscillator operation.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: April 14, 2015
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Gilles J. Muller, Jeffrey C. Cunningham, Karthik Ramanan
  • Patent number: 8981861
    Abstract: An injection locked pulsed oscillator includes a voltage controlled oscillator (VCO) responsive to an injection signal. The injection locked pulsed oscillator includes at least one enable circuit responsive to a first enable signal to enable output pulses from the VCO. The injection locked pulsed oscillator also includes timing circuit responsive to a pulse repetition frequency signal and is configured to provide the injection signal to phase lock the VCO and provide the first enable signal delayed from the injection signal to shape a width of the output pulses from the VCO.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 17, 2015
    Assignee: Hittite Microwave Corporation
    Inventors: Cemin Zhang, Christopher T. Lyons
  • Patent number: 8975972
    Abstract: An oscillator system includes a first oscillator, a second oscillator, and a changeover component. The first oscillator is configured to generate a first signal at a selected frequency. The second oscillator is configured to generate a second signal at about the selected frequency. The changeover component is configured to generate a changeover output signal according to the first signal and the second signal.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: March 10, 2015
    Assignee: Infineon Technologies AG
    Inventors: Michael Aichner, Mattias Welponer Bachmayer, Martin Flatscher
  • Patent number: 8963647
    Abstract: A method is provided for implementing a timer using a floating-gate transistor. The method includes: injecting a charge into a floating-gate transistor at an initial time, where a gate terminal of the floating-gate transistor is comprised of polysilicon encased by an insulating material; creating lattice imperfections at boundary of the polysilicon to cause leakage from the floating-gate transistor; measuring current read out from the floating-gate transistor at a time subsequent to the initial time; and determining an amount of time between the initial time and the subsequent time using the measured current.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: February 24, 2015
    Assignee: Board of Trustees of Michigan State University
    Inventor: Shantanu Chakrabartty
  • Patent number: 8860520
    Abstract: A pulse generator includes an oscillation circuit that generates a burst signal oscillated for ultrawideband band and a generation circuit that generates a trigger signal that causes oscillation by the oscillation circuit to be started.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: October 14, 2014
    Assignee: Fujitsu Limited
    Inventors: Yoichi Kawano, Toshihide Suzuki
  • Patent number: 8816787
    Abstract: A method includes providing an oscillator having a field effect transistor connected with a resonant circuit. The field effect transistor has a gate electrode coupled to a source of gate voltage, a source electrode, a drain electrode and a graphene channel disposed between the source electrode and the drain electrode and electrically connected thereto. The method further includes biasing the graphene channel via the gate electrode into a negative differential resistance region of operation to cause the oscillator to generate a frequency signal having a resonant frequency f0. There can be an additional step of varying the gate voltage so as to bias the graphene channel into the negative differential resistance region of operation and out of the negative differential resistance region of operation so as to turn on the frequency signal and to turn off the frequency signal, respectively.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: August 26, 2014
    Assignee: International Business Machines Corporation
    Inventors: Keith A. Jenkins, Yu-ming Lin
  • Patent number: 8791765
    Abstract: A Force-Mode Distributed Wave Oscillator (FMDWO) that provides accurate multiple phases of an oscillation, a Force Mode Distributed Wave Antenna as a radiating element, a Force-Mode Distributed Oscillator Amplifier (FMDOA) and an array of amplifiers capable of operating as a beam forming phased-array antenna driver. Two distinct force mode mechanisms, one delay-based and the other geometry-based, utilizing inverter amplifiers, inject an oscillation on independent conductor loops or rings via transmission lines forming a differential transmission medium for the oscillation wave. Once the oscillation wave is initiated through the forcing mechanisms, the oscillations continue uninterrupted independent of any external triggering.
    Type: Grant
    Filed: December 31, 2010
    Date of Patent: July 29, 2014
    Assignee: Waveworks, Inc.
    Inventors: Ahmed Emira, Ahmet Tekin, Damir Ismailov, Suat Utku Ay
  • Patent number: 8665035
    Abstract: Systems and methods for generating pulsed output signals that employ a gated RF oscillator circuit having an output that is switchably grounded through the emitter of a transistor and including feedback from the output of the circuit to the base of the transistor to create oscillations and to allow a digital input pulse of a desired length to control the start and stop of oscillations created by the transistor.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: March 4, 2014
    Assignee: L-3 Communications Integrated Systems LP
    Inventors: Ross A. McClain, Jr., Brian C. Rutherford
  • Patent number: 8665031
    Abstract: An oscillating circuit for determining a resonant frequency of an electro-mechanical oscillating device and for driving the electro-mechanical oscillating device at the determined resonant frequency includes a driving circuit and a start-up, impetus injection circuit. The driving circuit is configured to receive one or more reference signals and further configured to provide a driving signal related to the reference signals to the electro-mechanical oscillating device. The start-up, impetus injection circuit is operably coupled to the electro-mechanical oscillating device and configured to selectively provide a start-up excitation signal to the electro-mechanical oscillation device. The start-up, impetus injection circuit is activated upon start-up of the oscillating circuit to drive the electro-mechanical oscillation device and the driving circuit determines a resonant frequency by measuring a parameter related to the resonant frequency of the electro-mechanical oscillating device.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: March 4, 2014
    Assignee: Covidien LP
    Inventor: James A. Gilbert
  • Publication number: 20140028411
    Abstract: A system for managing a reference clock signal includes an XO; a signal buffer coupled to the XO and configured to drive a reference clock signal generated by the XO; and a first IC coupled to the signal buffer. The first IC includes an XO input buffer configured to receive the reference clock signal, to switch between an enabled, operational state and a disabled state, and to have a first operational impedance while in the enabled state; an impedance equivalence circuit configured to be in an enabled, operational state when the XO input buffer is in its disabled state and vice versa and to have a second operational impedance while in the enabled state that is equivalent to the first operational impedance; and a control mechanism configured to switch the XO input buffer and the impedance equivalence circuit between the enabled state and the disabled state.
    Type: Application
    Filed: July 26, 2012
    Publication date: January 30, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Bin Fan, Yiwu Tang, Kevin Hsi Huai Wang
  • Patent number: 8593231
    Abstract: In accordance with some embodiments of the present disclosure, an oscillator may include a crystal resonator and a squaring circuit coupled to the crystal resonator and configured to convert a sinusoidal signal produced by the crystal resonator to a square-wave signal, the squaring circuit comprising a bias circuit configured to transmit a selected bias voltage for the squaring circuit, the selected bias voltage selected from a plurality of potential bias voltages. In accordance with this and other embodiments of the present disclosure, an oscillator may include a crystal resonator, an inverter coupled in parallel with the crystal resonator, and a programmable voltage regulator coupled to the inverter. The programmable voltage regulator may be configured to supply a first supply voltage to the inverter during a startup duration of the oscillator, and supply a second supply voltage to the inverter after the startup duration, wherein the second supply voltage is lesser than the first supply voltage.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: November 26, 2013
    Assignee: Intel IP Corporation
    Inventors: John Simmons, Kristopher Kaufman
  • Patent number: 8558624
    Abstract: A semiconductor integrated circuit capable of reliably detecting oscillation stop of a vibrator-type oscillation circuit and reliably restarting the oscillation circuit when oscillation stop is detected is provided. The semiconductor integrated circuit includes one or more main oscillation circuits configured to generate a main clock signal by a vibrator, a ring oscillator configured to always operate independently of the main oscillation circuit, a main clock detection circuit configured to monitor the main clock signal on the basis of an output clock signal of the ring oscillator and to determine an operation state of the main oscillation circuit, and an switch circuit configured to switch a combination of elements making up the main oscillation circuit in response to a detection result of the main clock detection circuit.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: October 15, 2013
    Assignee: Panasonic Corporation
    Inventor: Kazuhisa Raita
  • Publication number: 20130241662
    Abstract: A variable injection-strength injection-locked oscillator (ILO) is described. The variable injection-strength ILO can output an output clock signal based on an input clock signal. The variable injection-strength ILO can pause, restart, slow down, or speed up the output clock signal synchronously with respect to the input clock signal in response to receiving power mode information. Specifically, the variable injection-strength ILO can be operated under relatively strong injection when the input clock signal is paused, restarted, slowed down, or sped up.
    Type: Application
    Filed: November 10, 2011
    Publication date: September 19, 2013
    Applicant: Rambus Inc.
    Inventors: Marko Aleksic, Brian S. Leibowitz
  • Patent number: 8525603
    Abstract: An oscillating signal generating device includes an oscillating circuit and a control circuit. The oscillating circuit includes: a resonator having a first terminal and a second terminal for generating an oscillating signal, a resistive element having a first terminal coupled to the first terminal of the resonator, and a second terminal coupled to the second terminal of the resonator, and an oscillating start-up circuit having an input terminal coupled to the first terminal of the resonator and an output terminal coupled to the second terminal of the resonator. The control circuit generates a control signal to change the oscillating start-up circuit into a disable mode from an enable mode when the oscillating circuit generates an oscillating output signal under an operation mode, and outputs the oscillating signal generated by the resonator as the oscillating output signal of the oscillating circuit.
    Type: Grant
    Filed: September 27, 2010
    Date of Patent: September 3, 2013
    Assignee: Silicon Motion Inc.
    Inventor: Shuo-Chun Hung
  • Patent number: 8493156
    Abstract: According to an exemplary embodiment, a high amplitude oscillation generator includes an LC tank circuit, a gain stage, a dynamic bias circuit, a bias current source, and a dynamic bias circuit receiving a current source feedback voltage and outputting a gain stage bias voltage. The dynamic bias circuit adjusts the gain stage bias voltage in response to a change in the current source feedback voltage after a start up of the LC tank circuit. The dynamic bias circuit thereby increases an amplitude of oscillations produced by the oscillation generator. The dynamic bias circuit can include an error amplifier, the error amplifier generating the gain stage bias voltage responsive to the current source feedback voltage. The current source feedback voltage can change with a voltage drop across the bias current source. The current source feedback voltage can also be received from an output of the oscillation generator.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: July 23, 2013
    Assignee: Broadcom Corporation
    Inventor: Zhiheng Cao
  • Publication number: 20130169372
    Abstract: A pulse generator includes an oscillation circuit that generates a burst signal oscillated for ultrawideband band and a generation circuit that generates a trigger signal that causes oscillation by the oscillation circuit to be started.
    Type: Application
    Filed: October 23, 2012
    Publication date: July 4, 2013
    Applicant: FUJITSU LIMITED
    Inventor: FUJITSU Limited
  • Patent number: 8441386
    Abstract: A SAR ADC includes a DAC including a first set of capacitors each having a first end connected to a common node, and a second end, and a first set of switches each connecting the second end of a respective one of the capacitors to a first reference voltage. The SAR ADC further includes a second set of capacitors each having a first end connected to the common node and a second end that receives an input to be converted when the common node is connected to ground. The SAR ADC further includes a second set of switches that selectively connect the second end of a first capacitor of the second set of capacitors to ground when the input is disconnected from the second ends of the second set of capacitors and when the common node is disconnected from ground during a first of a plurality of successive approximations.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: May 14, 2013
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Jonathan Ronald Francis Strode
  • Patent number: 8427242
    Abstract: A method for generating an UWB pulses based on LC oscillator topology. Fast turn on of the oscillator is achieved by creating large asymmetry in a normally symmetrical topology which is used in a typical differential type oscillator. One method for achieving large asymmetry is activating one branch of a differential pair of branches for a short duration before activating both branches in a normal operation. The bandwidth of the pulse is controlled by modifying the duration of the oscillator activation. Fast turn on and turn off is essential for high bandwidth generation. The method is adaptable for generating binary phase shift keying (BPSK) modulation. Selecting the activated branch of a fully symmetrical topology controls the output phase and creates two possibilities which differ exactly by 180 degrees. In a preferred embodiment, all the pulse generator components are on-clip leading to a low cost solution. The circuit can generate high power pulses directly on a load.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: April 23, 2013
    Assignee: Zebra Enterprises Solutions Corp.
    Inventors: Dani Raphaeli, Guy Shasha
  • Patent number: 8258886
    Abstract: An oscillating circuit for determining a resonant frequency of an electro-mechanical oscillating device and for driving the electro-mechanical oscillating device at the determined resonant frequency includes a driving circuit and a start-up, impetus injection circuit. The driving circuit is configured to receive one or more reference signals and further configured to provide a driving signal related to the reference signals to the electro-mechanical oscillating device. The start-up, impetus injection circuit is operably coupled to the electro-mechanical oscillating device and configured to selectively provide a start-up excitation signal to the electro-mechanical oscillation device. The start-up, impetus injection circuit is activated upon start-up of the oscillating circuit to drive the electro-mechanical oscillation device and the driving circuit determines a resonant frequency by measuring a parameter related to the resonant frequency of the electro-mechanical oscillating device.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: September 4, 2012
    Assignee: TYCO Healthcare Group LP
    Inventor: James A. Gilbert
  • Patent number: 8228126
    Abstract: A clock and data recovery circuit is disclosed and comprises a gated voltage-controlled oscillator (GVCO), a PLL unit, a phase-controlled frequency divider, a multiplexer, a matching circuit and a double-edge-triggered D flip-flop (DDFF). The GVCO receives a data signal and a reference voltage to generate first and second clock signals. The PLL unit receives a reference clock signal and generates the reference voltage to adjust the first and second clock signals at the vicinity of the predetermined frequency. The phase-controlled frequency divider receives and divides the first clock signal by N to output a third clock signal. The multiplexer controlled by a selection signal receives and outputs the second or the third clock signal. The matching circuit receives the data signal and the selection signal to match the delays therebetween. The DDFF receives the output signals from the matching circuit and the multiplexer, and outputs a recovered data signal.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: July 24, 2012
    Assignees: Mediatek Inc., National Taiwan University
    Inventors: Che-Fu Liang, Sy-Chyuan Hwu, Shen-Iuan Liu
  • Patent number: 8169268
    Abstract: An oscillation circuit, and a semiconductor device incorporating same, include: an oscillation unit with a plurality of inverters and configured to perform signal transmission between first and second nodes of the inverters such that each of the inverters performs an oscillation operation to generate clock signals having different phases when a control signal is activated, and latch a clock signal of the second node and cut off the signal transmission between the first and second nodes to stop the oscillation operations of the inverters when the control signal is deactivated; and a control unit to activate the control signal when an oscillation enable signal is activated, and deactivate the control signal using one of a clock signal output from an inverter connected to the second node and clock signals of which the phases lag that of a clock signal of the first node, when the oscillation enable signal is deactivated.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: May 1, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ji-Hoon Lim, Jeong-Don Lim, Kwang-Il Park
  • Patent number: 8115562
    Abstract: Disclosed is an oscillator in which current consumption relating to oscillation is reduced. The oscillator comprises: an amplifier to an input and output of which a piezoelectric oscillator and a feedback resistor are connected in parallel, and which is constituted by a CMOS logic inverter circuit; and a control circuit, which is constituted by a CMOS logic circuit, for clamping input/output levels of the amplifier and halting oscillation before oscillation start-up, unclamping the input/output levels at beginning of oscillation start-up and supplying a pulse signal to an output terminal of the amplifier a prescribed period of time after the beginning of oscillation start-up.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: February 14, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Hatsuhide Igarashi
  • Patent number: 8085104
    Abstract: An oscillation circuit, a driving circuit thereof, and a driving method thereof are provided. The driving circuit generates a second enable signal according to an output signal of an oscillator and a first enable signal. The second enable signal is transmitted to the oscillator. When a number of waves of the output signal within a predetermined period is smaller than a predetermined value, the driving circuit adjusts a voltage level of the second enable signal. A voltage level of the first enable signal is equal to an enable voltage level. Through variations in voltage levels of the second enable signal, the oscillator is triggered to oscillate.
    Type: Grant
    Filed: July 10, 2009
    Date of Patent: December 27, 2011
    Assignee: Phison Electronics Corp.
    Inventors: Yu-Tong Lin, Yun-Chieh Chen
  • Patent number: 8076981
    Abstract: An oscillator that increases the accuracy of an output frequency, without using a charge pump, has an oscillation circuit, first and second voltage supply circuits, and a calibration value generation circuit. The first voltage supply circuit includes a resistor and a capacitor, the resistance and capacitance of which are determined so that a first voltage reaches a reference voltage within a reference time. The second voltage supply circuit includes first and second switching means, which perform switching when receiving pulse signals corresponding to the frequency of the oscillation circuit to raise the second voltage. A calibration value generation circuit provides the oscillation circuit with a calibration value that lowers the frequency when the second voltage reaches the reference voltage before the first voltage and raises the frequency when the second voltage reaches the reference voltage after the first voltage.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: December 13, 2011
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Eji Shikata
  • Patent number: 8072273
    Abstract: A synchronized clock system, for use with an electronic system having several system nodes requiring a synchronized clock signal. The clock system may be formed in either discrete form or in integrated form, or in any combination, and includes a first synch bus and a second synch bus, isolated from the first synch bus, and at least one pair and preferably several pairs of SXO modules connected to the busses in alternating fashion. Each of the system nodes is connected at a different one of any number of arbitrarily selected connection points anywhere along the first bus. The points along the busses at which the SXO modules are connected are spaced roughly equidistantly apart. The system nodes are connected to the bus by means of signal conditioning circuits, which may include correction circuits, an amplifier, a frequency multiplier, a logic translator and a fan buffer.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: December 6, 2011
    Assignee: NEL Frequency Controls, Inc.
    Inventors: Roman Boroditsky, Jorge Gomez
  • Patent number: 8054141
    Abstract: A relaxation oscillator includes a capacitor connected to a comparator input, current sources switched to supply power to the capacitor based on an output of the comparator, and a duplicate integrator shifting a voltage on the capacitor to offset a propagation delay through the comparator. The duplicate integrator includes current sources and a capacitor matching and switched in tandem with those within the relaxation oscillator, plus an additional current source, and is selectively switched into connection with the comparator input. By canceling the comparator propagation delay, the oscillator output frequency can be stably controlled through selection of resistive and capacitive values, using cheaper technology and tolerating large temperature, voltage and process variations.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: November 8, 2011
    Assignee: STMicroelectronics, Inc.
    Inventor: Sooping Saw
  • Patent number: 8031010
    Abstract: The present invention is a Chip Scale Atomic Clock (CSAC)-enabled Time and Frequency Standard (CTFS) architecture. The CTFS architecture includes a microcontroller, a Time Compensated Crystal Oscillator (TCCO) circuit which is connected to the microcontroller, and a Chip Scale Atomic Clock (CSAC) which is connected to the microcontroller. The microcontroller is configured for selectively causing the CTFS to provide a TCCO circuit-based output frequency when the CTFS has not locked to a predetermined atomic resonance, and is further configured for causing the CTFS to provide a CSAC-based output frequency when the CTFS has locked to a predetermined atomic resonance.
    Type: Grant
    Filed: September 24, 2009
    Date of Patent: October 4, 2011
    Assignee: Rockwell Collins, Inc.
    Inventors: Roy W. Berquist, Robert A. Newgard, Joseph M. Bohl
  • Patent number: 8031021
    Abstract: Provided are an oscillatory circuit based on a metal-insulator transition (MIT) device that can generate a simple and very high oscillating frequency using the MIT device, and a method of driving the oscillatory circuit. The oscillatory circuit includes the MIT device that comprises an MIT thin film and an electrode thin film connected to the MIT thin film and in which an abrupt MIT is generated due to an MIT generating voltage, a resistor that is serially connected to the MIT device, an electric al power source limiting the maximum amount of an applied current and applying a direct current constant voltage to the MIT device, and a light source irradiating electromagnetic waves on the MIT device, wherein the oscillating properties are generated by irradiating the electromagnetic waves using the light source.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: October 4, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yong-Wook Lee, Bongjun Kim, Sungyoul Choi, Jungwook Lim, Sun-Jin Yun, Byung-Gyu Chae, Hyun-Tak Kim, Gyungock Kim
  • Patent number: 8031022
    Abstract: Provided are an MIT device-based oscillation circuit including a power source, an MIT device and a variable resistor, in which a generation of an oscillation and an oscillation frequency are determined according to a voltage applied from the power source and a resistance of the variable resistor, and a method of adjusting the oscillation frequency of the oscillation circuit. The MIT device includes an MIT thin film and an electrode thin film connected to the MIT thin film, and generates a discontinuous MIT at an MIT generation voltage, the variable resistor is connected in series to the MIT device, and the power source applies a voltage or an electric current to the MIT device. The generation of an oscillation and an oscillation frequency are determined according to the voltage applied from the power source and the resistance of the variable resistor.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: October 4, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yong-Wook Lee, Bong-Jun Kim, Hyun-Tak Kim, Sung-Youl Choi, Byung-Gyu Chae, Jung-Wook Lim, Sun-Jin Yun
  • Patent number: 8026771
    Abstract: A driver device that forms an oscillation loop with a vibrator and causes the vibrator to produce driving vibrations includes a current-voltage converter that converts a current that flows through the vibrator into a voltage, an output circuit that causes the vibrator to produce the driving vibrations based on a signal that is converted into a voltage with respect to a given voltage, and a high-pass filter that is provided in the oscillation loop between the current-voltage converter and the output circuit. The driver device causes the vibrator to produce the driving vibrations while changing a reference potential of the high-pass filter, and then causes the vibrator to produce the driving vibrations while fixing the reference potential.
    Type: Grant
    Filed: November 26, 2007
    Date of Patent: September 27, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Masahiro Kanai, Naoki Yoshida, Eitaro Otsuka
  • Patent number: 8008981
    Abstract: A multi-phase ultra-wideband signal generator uses differential pulse oscillators. The multi-phase ultra-wideband signal generator using differential pulse oscillators includes N pulse oscillators for generating pulse signals based on a supply of power, and further comprises N inverting amplification units for outputting inverted amplified signals of output signals of the N pulse oscillators when a number of pulse oscillators is at least two, wherein, when the number of pulse oscillators is an even or odd number, the pulse oscillators are arrayed such that they have a connection form in which output terminals OUT(+) and OUT(?) of a relevant pulse oscillator are connected to output terminals OUT(+) and OUT(?) of a next pulse oscillator through a relevant inverting amplification unit, and the connection form is consecutively applied to the pulse oscillators.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: August 30, 2011
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Seong Cheol Hong, Sang Hoon Sim
  • Patent number: 7961056
    Abstract: Embodiments of the present invention include a low phase noise oscillator circuit using a current-reuse technique to reduce power consumption and improve phase noise, where the oscillator circuit comprises a first VCO coupled to a second VCO, and the outputs of the first and second VCOs are coupled with passive elements, such as capacitors. The overall power consumption of both the first and second VCOs is about the same as a single VCO. Furthermore, the phase noise is lowered by around 3 dB. Thus, the phase noise performance is improved without increasing the power consumption of the oscillator circuit.
    Type: Grant
    Filed: September 10, 2009
    Date of Patent: June 14, 2011
    Assignee: Intel Corporation
    Inventors: Stewart S. Taylor, Diptendu Ghosh
  • Patent number: 7961055
    Abstract: A phase locked loop circuit includes an oscillator part configured to generate a reference signal by amplifying a signal generated by an oscillator, and a phase locked loop part configured to include a filter that outputs a control signal to a clock transmitting circuit that generates a clock signal in accordance with a phase difference between the reference signal and a feedback signal, wherein a drive capability of the oscillator part is controlled in accordance with the control signal.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: June 14, 2011
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Shinji Miyata, Masahiro Tanaka
  • Patent number: 7915964
    Abstract: A variable frequency oscillating circuit has an oscillating circuit that undergoes an oscillation operation. The oscillating circuit has at least one inverter and at least one capacitor forming a circuit in a ring oscillator configuration. A current circuit outputs a current based on a frequency control signal controlling a frequency of a clock signal output from the oscillating circuit. A pulse generating circuit generates a pulse when the frequency control signal is switched from low to high and from high to low. The oscillating circuit stops an oscillation operation by stopping a charge/discharge operation of the at least one capacitor when the pulse is generated by the pulse generating circuit.
    Type: Grant
    Filed: August 27, 2008
    Date of Patent: March 29, 2011
    Assignee: Seiko Instruments Inc.
    Inventor: Minoru Ariyama
  • Patent number: 7911235
    Abstract: Disclosed is a logarithmic detector comprising: an amplifier element; means for setting a frequency of operation of the detector; and a controller, wherein an input signal to the amplifier element is arranged to cause an oscillation in the amplifier element, and the controller is operable to sense a pre-determined threshold, indicative of oscillation and, in response to sensing said threshold, to interrupt the oscillation of the amplifier such that the frequency of said interruption is proportional to the logarithm of the power of the input signal.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: March 22, 2011
    Assignee: DockOn AG
    Inventor: Forrest James Brown
  • Patent number: 7876198
    Abstract: An adaptive intelligent electronic horn (100) comprises a mechanical soniferous apparatus (112), an electromagnetic coil (106), a driver circuit (104) and an oscillating circuit (102). A sensor (110) is provided between the mechanical soniferous apparatus (112) and the oscillating circuit (102). An on-off ratio adjusting circuit (108) is provided at the input end of the oscillating circuit (102). The sensor (110) measures the oscillation frequency of the mechanical soniferous apparatus (112) and feedbacks the measured oscillation frequency signal to the oscillating circuit (102). The on-off ratio adjusting circuit (108) controls a pulse width of an oscillation signal from the oscillating circuit (102) based on a voltage of power supply and/or an ambient temperature. The oscillating circuit (102) outputs corresponding oscillation signal to the driver circuit (104) based on the oscillation frequency signal received from the sensor (110) and/or the control signal from the on-off ratio adjusting circuit (108).
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: January 25, 2011
    Inventor: Hongwei Zhao
  • Patent number: 7859421
    Abstract: A circuit arrangement for detecting voltage changes, comprising supply terminals configured to apply a first potential and a second potential, a first oscillator and a second oscillator, which are operated with the first potential and the second potential, a voltage dependence of the frequency of the first oscillator differing from a voltage dependence of the frequency of the second oscillator, a first evaluation circuit configured to evaluate the frequency of the first oscillator and a second evaluation circuit configured to evaluate the frequency of the second oscillator, and a comparison circuit configured to compare a value based on the evaluated frequencies of the first oscillator and of the second oscillator with a predetermined threshold value, and to output a voltage change signal indicating an impermissible voltage change between the first potential and the second potential depending on the result of the comparison.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: December 28, 2010
    Assignee: Infineon Technologies AG
    Inventors: Joerg Berthold, Christian Pacha, Artur Wroblewski
  • Patent number: 7859354
    Abstract: Ring oscillator circuitry is provided. The ring oscillator circuitry may include a loop of inverters. A control gate may be interposed in the loop to control operation of the loop. The control gate may be activated using a ring oscillator trigger signal. During application of the trigger signal, the trigger signal may become degraded due to circuit parasitics. Trigger signal conditioning circuitry may be used to remove noise from the degraded trigger signal. A version of the trigger signal that has been conditioned by the trigger signal conditioning circuitry may be applied to a control input of the control gate. The trigger signal conditioning circuitry may include a low pass filter, a hysteresis circuit, and a two-stage buffer. The two-stage buffer may be formed from transistors with the same characteristics as the transistors in the inverters of the ring oscillator loop.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: December 28, 2010
    Assignee: Altera Corporation
    Inventors: Shuxian Chen, Jeffrey T. Watt
  • Publication number: 20100264999
    Abstract: An oscillation circuit, a driving circuit thereof, and a driving method thereof are provided. The driving circuit generates a second enable signal according to an output signal of an oscillator and a first enable signal. The second enable signal is transmitted to the oscillator. When a wave number of the output signal is smaller than a predetermined value during a predetermined period, the driving circuit adjusts a voltage level of the second enable signal. A voltage level of the first enable signal is equal to an enable voltage level. Through variations in voltage levels of the second enable signal, the oscillator is triggered to oscillate.
    Type: Application
    Filed: July 10, 2009
    Publication date: October 21, 2010
    Inventors: YU-TONG LIN, Yun-Chieh Chen
  • Patent number: 7808334
    Abstract: An oscillation driver circuit that drives a physical quantity transducer includes a one-input/two-output comparator. The one-input/two-output comparator includes a shared differential section that compares a voltage signal input from a drive current/voltage conversion amplifier circuit with a given voltage, a first output section that receives a signal output from the differential section, variably adjusts a voltage amplitude of the received signal, and outputs the resulting signal, and a second output section that receives the signal output from the differential section, and outputs a synchronous detection reference signal of which the voltage amplitude is fixed.
    Type: Grant
    Filed: July 22, 2008
    Date of Patent: October 5, 2010
    Assignee: Seiko Epson Corporation
    Inventors: Naoki Yoshida, Masahiro Kanai, Eitaro Otsuka
  • Patent number: 7768359
    Abstract: A differential crystal oscillator circuit uses a bias transistor to generate a bias voltage from a bias current. The bias voltage is supplied to the control terminals of a differential pair of transistors. The differential transistors operate to produce a differential output between corresponding end terminals thereof, which is provided to a reference crystal oscillator to establish an oscillation frequency at the differential output.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: August 3, 2010
    Assignee: Broadcom Corporation
    Inventors: Yuyu Chang, Hooman Darabi
  • Patent number: 7764137
    Abstract: A circuit can include an amplifier having at least a first junction field effect transistor (JFET) of a first conductivity type with a source coupled to a first power supply node, and a drain coupled to an amplifier output node. A first variable bias circuit can be coupled between the drain and at least one gate of the first JFET. The first variable bias circuit can alter a direct current (DC) bias to the first JFET according a potential at the amplifier output node. A first bias impedance can be coupled between the drain of the first JFET and a second power supply node. The circuit can also include a non-linear transmission line (NLTL) coupled between the amplifier output and a gate of the first JFET. The NLTL being configured to propagate an electrical soliton.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: July 27, 2010
    Assignee: SuVolta, Inc.
    Inventor: Christopher L. Hamlin
  • Patent number: 7728683
    Abstract: A phase recovery circuit for avoiding noise interfering with the clock signal generated from an oscillator is disclosed. The phase recovery circuit includes a noise detector, a phase detector, and a phase locker. The noise detector detects noise and accordingly generates a noise detecting signal. The phase detector is triggered by the noise detecting signal for detecting the phase of the clock signal and accordingly generating a phase detecting signal. The phase locker locks the phase of the clock signal to a predetermined phase within a predetermined period after the occurrence of the noise detecting signal, and after the predetermined period, the phase locker releases the clock signal. In this way, the phase of the clock signal is not affected by noise.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: June 1, 2010
    Assignee: Leadtrend Technology Corp.
    Inventor: Ju-Lin Chia
  • Patent number: 7719368
    Abstract: A method of eliminating a runaway condition in a PLL includes the steps of: determining whether the PLL is locked to an input reference signal; when the PLL is not locked to the input reference signal, determining whether a frequency of an output signal generated by the PLL exceeds a prescribed maximum frequency; and when the frequency of the output signal generated by the PLL exceeds the prescribed maximum frequency, resetting the PLL to thereby eliminate the runaway condition.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: May 18, 2010
    Assignee: Agere Systems Inc.
    Inventors: Paul Jeffrey Smith, Travis A. Bradfield, Jeffrey K. Whitt
  • Patent number: 7719373
    Abstract: A device and a method are presented for generating an intermitted oscillating signal comprising a plurality of oscillating portions separated from each other in time. The device and method are suited for communication systems, in particular for Ultra-Wide Bandwidth (UWB) applications. The device comprises a variable oscillator for generating the oscillating portions; switching circuitry for switching on/switching off the variable oscillator at the beginning/end of each oscillating portion; and circuitry for setting initial conditions in the variable oscillator to impose a predefined transient and a characterizing frequency upon each start-up.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: May 18, 2010
    Assignee: IMEC
    Inventors: Julien Ryckaert, Jan Craninckx
  • Patent number: 7714673
    Abstract: The present invention relates to a control method for the operation modes of an oscillator and the apparatus thereof, for which the method and the apparatus can be applied to the electronic circuits with multi-operation modes of the oscillator so as to correctly choose the desirable oscillator operation mode. Furthermore, an oscillator checking circuit sets up the oscillation mode automatically and judges if the oscillator operates properly. Hence, there is no need for the user to set up the oscillator operation mode manually.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: May 11, 2010
    Assignee: Holtek Semiconductor Inc.
    Inventors: Jia-Hsuan Wu, Cheng-Mu Wu
  • Patent number: 7692506
    Abstract: An oscillation driver device includes a gain control amplifier, an automatic gain control circuit, and a mode setting circuit. When the mode setting circuit has switched a mode from a normal operation mode to a low power consumption mode, the automatic gain control circuit is disabled, and the gain in an oscillation loop that drives the vibrator changes from a state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit to a state in which the gain in the oscillation loop is set to be larger than unity. When the mode setting circuit has switched the mode from the low power consumption mode to the normal operation mode, the automatic gain control circuit resumes operation, and the gain in the oscillation loop changes from the state in which the gain in the oscillation loop is set to be larger than unity to the state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: April 6, 2010
    Assignee: Seiko Epson Corporation
    Inventors: Masahiro Kanai, Eitaro Otsuka, Naoki Yoshida