Patents Examined by Joseph Chang
  • Patent number: 11070212
    Abstract: Provided is an oscillator including: a first resonator; a second resonator; a first oscillation circuit generating a first oscillation signal by oscillating the first resonator; a second oscillation circuit generating a second oscillation signal that has frequency-temperature characteristics different from frequency-temperature characteristics of the first oscillation signal by oscillating the second resonator; a clock signal generation circuit generating a clock signal with a frequency that is temperature compensated by temperature compensation data; and a processing circuit performing time digital conversion processing based on the first oscillation signal and the second oscillation signal, and obtaining the temperature compensation data based on measurement data of the time digital conversion processing.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: July 20, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Yasuhiro Sudo
  • Patent number: 11070168
    Abstract: A variable-frequency oscillator generates an oscillator clock having a frequency that corresponds to a control signal. A programmable frequency divider divides the oscillator clock, so as to generate a divided clock. A F/V converter circuit includes a capacitor and a switch that switches at a frequency that corresponds to the divided clock, and generates a detection voltage that corresponds to a reference current. A reference voltage source outputs a reference voltage that corresponds to the electric potential that occurs at the resistor due to a reference current. A feedback circuit adjusts a control signal such that the detection voltage approaches the reference voltage. A correction circuit changes the frequency-dividing ratio of the programmable frequency divider based on a modulation signal modulated according to a correction coefficient that corresponds to the temperature.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: July 20, 2021
    Assignee: ROHM CO., LTD.
    Inventor: Masanobu Tsuji
  • Patent number: 11070215
    Abstract: A method of operation in a locked-loop circuit. The locked-loop circuit includes a loop filter and a digitally-controlled oscillator (DCO). The loop filter includes a first input to receive a digital word representing a difference between a reference clock frequency and a DCO output frequency. The loop filter includes internal storage. The method includes selecting a desired DCO output frequency that is generated in response to a calibration DCO codeword. A start value is retrieved from the loop filter internal storage. The start value corresponds to the calibration DCO codeword. The locked-loop circuit is then started with the retrieved start value.
    Type: Grant
    Filed: March 17, 2020
    Date of Patent: July 20, 2021
    Assignee: Movellus Circuits, Inc.
    Inventors: Frederick Christopher Candler, Jeffrey Fredenburg
  • Patent number: 11070216
    Abstract: A method of operation in a locked-loop circuit. The locked-loop circuit includes a loop filter and a digitally-controlled oscillator (DCO) coupled to the output of the loop filter. The loop filter includes a first input to receive a digital word representing a difference between a reference clock frequency and a DCO output frequency. The method includes determining a calibration DCO codeword representing a calibration operating point for the locked-loop circuit; determining a scaling factor based on the calibration operating point, the scaling factor based on a ratio of an actual DCO gain to a nominal DCO gain; and applying the scaling factor to operating parameters of the loop filter.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: July 20, 2021
    Assignee: Movellus Circuits, Inc.
    Inventors: Frederick Christopher Candler, Jeffrey Fredenburg
  • Patent number: 11063557
    Abstract: An oscillator circuit includes a circuit for oscillation that oscillates a resonator and outputs an oscillation signal, a temperature sensing element that outputs a temperature detection signal, an analog/digital conversion circuit that converts the temperature detection signal into a temperature code which is a digital signal and converts a power supply voltage into a power supply voltage code which is a digital signal, and a digital signal processing circuit that generates a correction code based on the power supply voltage code, and generates a temperature compensation code for compensating frequency-temperature characteristics of the oscillation signal based on the temperature code and the correction code.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: July 13, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Tomohiro Uno
  • Patent number: 11050385
    Abstract: An oscillator operable in Class-C comprises at least one set of cross-coupled transistors. A threshold voltage of the transistors is controllable by having a bias voltage applied at back-gates of the transistors. The bias voltage thereby controls a conduction angle of the transistors to enable operation of the oscillator in Class-C. There is further provided a radio transceiver comprising such an oscillator, a method of operating such an oscillator, and a controller configured to operate such an oscillator.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: June 29, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Andreas Kämpe
  • Patent number: 11043935
    Abstract: An LVDS driver circuit includes: a current source; a differential unit configured to receive a first input signal and a second input signal and output a first output signal and a second output signal; and a feedback control circuit configured to be coupled to a first output node and a second output node and to perform, by outputting a control voltage to a gate of a transistor, feedback control that sets a common voltage of a differential output signal. In the differential unit, the first output node and the second output node are in a high impedance state in the high impedance mode, the differential unit is configured to output the first output signal and the second output signal in the signal output mode, and the control voltage in the high impedance mode is larger than the control voltage in the signal output mode.
    Type: Grant
    Filed: April 1, 2020
    Date of Patent: June 22, 2021
    Inventor: Masataka Nomura
  • Patent number: 11043917
    Abstract: Embodiments of the present disclosure disclose an optoelectronic oscillator including an optical chip and a microwave chip. The optical chip is implemented by fabricating different optoelectronic devices on an integrated optical substrate, comprising: a laser assembly; a mode selection device coupled to the laser assembly, and configured to receive the laser and perform mode selection; an optical delay module coupled to the mode selection device; and a detector coupled to the optical delay module. The microwave chip is a microwave integrated circuit formed by fabricating microwave elements on a semiconductor substrate, comprising: a microwave processing circuit configured to receive microwave signal and perform signal processing; a coupler coupled to the microwave processing circuit, and configured to provide a part of the microwave signal to a phase shifter and output the other part thereof; and a phase shifter configured to feed the phase-shifted microwave signal to the laser assembly.
    Type: Grant
    Filed: May 12, 2020
    Date of Patent: June 22, 2021
    Assignee: INSTITUTE OF SEMICONDUCTORS, CHINESE ACADEMY OF SCIENCES
    Inventors: Ming Li, Dapeng Liu, Nuannuan Shi, Tengfei Hao, Ninghua Zhu
  • Patent number: 11038382
    Abstract: The present invention relates to a foreign object detecting method, and a device and system therefor.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: June 15, 2021
    Assignee: LG INNOTEK CO., LTD.
    Inventors: Jae Hee Park, Yong Il Kwon
  • Patent number: 11038510
    Abstract: A system and method for making time error estimations and time corrections for substantially long deployment times are provided. The system has a low power local oscillator, a power source, a processor, a computer-readable storage medium, a phase meter, a counter circuit, a temperature sensor, and a communication port. Time signal measurements and frequency signal measurements are made at a first time and at a second time, and time-dependent or both time and temperature-dependent time error estimations are generated for interval times between the first time and the second time using a dual-linear estimation technique. A corrected time-tag data set having highly accurate time-tags may then be generated from the time-dependent time error estimation or both the time and the temperature-dependent time error estimation.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: June 15, 2021
    Assignee: Timecubic, Inc.
    Inventor: Sheng Chang
  • Patent number: 11038462
    Abstract: There is provided a semiconductor device including an oscillation circuit that includes a plurality of capacitors provided on a semiconductor substrate, a conversion circuit that converts an analog signal into a digital signal, and a switch circuit that switches the capacitors on the basis of the digital signal. Further, an oscillation frequency linearly varies with respect to a variation in the analog signal.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: June 15, 2021
    Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Hidenori Takeuchi, Taiwa Okanobu, Naoya Arisaka, Hitoshi Tomiyama
  • Patent number: 11038463
    Abstract: An integrated circuit device includes a first pad and a second pad electrically coupled to one end and the other end of a resonator, an oscillation circuit that is electrically coupled to the first pad and the second pad and generates an oscillation signal by causing the resonator to oscillate, and an output circuit that outputs a clock signal based on the oscillation signal. The oscillation circuit is disposed along a first side of the integrated circuit device among the first side, a second side that intersects the first side, a third side that is an opposite side of the first side, and a fourth side that is an opposite side of the second side. The first pad and the second pad are disposed in the oscillation circuit along the first side in a plan view, and the output circuit is disposed along the second side.
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: June 15, 2021
    Inventors: Mitsuaki Sawada, Naoki Il, Yosuke Itasaka
  • Patent number: 11027674
    Abstract: A plus-side main connection line (17) connects electrical equipment (11), (12) to a plus terminal (16A) of a battery (16). A plus-side isolating switch (18) is provided in the plus-side main connection line (17) to connect or disconnect the electrical equipment (11), (12) and or from the plus terminal (16A) of the battery (16). A plus-side auxiliary connection line (20) connects a communication terminal (15) to the plus terminal (16A) of the battery (16) in a position upstream of the plus-side isolating switch (18). A minus-side main connection line (22) connects a minus terminal (16B) of the battery (16) to ground. A minus-side isolating switch (23) is provided in the minus-side main connection line (22) to connect or disconnect the minus terminal (16B) of the battery (16) and or from the ground.
    Type: Grant
    Filed: November 27, 2018
    Date of Patent: June 8, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Tomoya Murazumi, Takenori Hiroki, Hisashi Tago, Hironori Itou
  • Patent number: 11025199
    Abstract: An oscillator comprising: a resonator including a negative resistance element; a voltage bias circuit configured to apply a voltage across the negative resistance element; and a first shunt element in which a resistor and a capacitor are electrically connected in series, wherein the negative resistance element and the first shunt element are electrically connected in parallel to the voltage bias circuit.
    Type: Grant
    Filed: February 20, 2020
    Date of Patent: June 1, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Kandori, Noriyuki Kaifu
  • Patent number: 11025194
    Abstract: An integrated circuit device includes an oscillation circuit that generates an oscillation signal by causing a resonator to oscillate, a temperature compensation circuit that performs temperature compensation of an oscillation frequency of the oscillation circuit, an output circuit that outputs a clock signal based on the oscillation signal, a first regulator that generates a first regulated power supply voltage based on a power supply voltage and supplies the first regulated power supply voltage to the temperature compensation circuit, and a second regulator that generates a second regulated power supply voltage based on the power supply voltage and supplies the second regulated power supply voltage to the output circuit.
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: June 1, 2021
    Inventor: Mitsuaki Sawada
  • Patent number: 11025258
    Abstract: Systems and methods for integrating injection-locked oscillators into transceiver arrays are disclosed. In one aspect, there is provided an injection-locked oscillator (ILO) distribution system including a master clock generator configured to generate a master clock signal. The ILO distribution system also includes an ILO distribution circuit including an ILO and configured to receive the master clock signal. The ILO is configured to generate a reference clock signal based on the master clock signal. The ILO distribution circuit is further configured to generate an output signal indicative of an operating frequency of the ILO. The ILO distribution system further includes an injection-locked detector (ILD) configured to receive the master clock signal and the output signal. The ILD is further configured to determine whether the ILO is in a locked state or in an unlocked state based on the master clock signal and the output signal.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: June 1, 2021
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sanjeev Jain, Foad Arfaei Malekzadeh
  • Patent number: 11025234
    Abstract: Methods and systems for regulating supply voltage is described. In an example, a device can receive unregulated supply. The device can be connected to a ring oscillator and an integrated circuit. The device can be configured to regulate the unregulated supply to a first voltage. The device can be further configured to provide the regulated supply to the ring oscillator, where the ring oscillator operates with the regulated supply. The device can be further configured to, in response to a change in the regulated supply from the first voltage to a second voltage, adjust the changed regulated supply to return to the first voltage to cause the ring oscillator to operate with a constant regulated supply having the first voltage.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: June 1, 2021
    Assignee: International Business Machines Corporation
    Inventors: Sudipto Chakraborty, Rajiv Joshi, Steven J. Holmes, Bruce B. Doris
  • Patent number: 11025259
    Abstract: Systems and methods for integrating injection-locked oscillators into transceiver arrays are disclosed. In one aspect, there is provided an injection-locked oscillator (ILO) distribution system including a master clock generator configured to generate a master clock signal. The ILO distribution system also includes an ILO distribution circuit including an ILO and configured to receive the master clock signal. The ILO is configured to generate a reference clock signal based on the master clock signal. The ILO distribution circuit is further configured to generate an output signal indicative of an operating frequency of the ILO. The ILO distribution system further includes an injection-locked detector (ILD) configured to receive the master clock signal and the output signal. The ILD is further configured to determine whether the ILO is in a locked state or in an unlocked state based on the master clock signal and the output signal.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: June 1, 2021
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sanjeev Jain, Foad Arfaei Malekzadeh
  • Patent number: 11025055
    Abstract: The disclosure relates to an inverter with at least one inverter bridge and at least two DC converters, the outputs of the DC converters being connected to inputs of the inverter. The inverter includes an exchangeable adapter having input terminals for connection to power sources or loads and output terminals connected via input terminals to inputs of the DC-DC converters. Within the adapter each of the output terminals is connected to one of the input terminals and/or another of the output terminals.
    Type: Grant
    Filed: October 23, 2019
    Date of Patent: June 1, 2021
    Assignee: SMA Solar Technology AG
    Inventors: Stefan Buchhold, Jens Friebe, Michael Kotthaus, Torsten Soederberg, Thomas Wappler, Ephraim Moeser
  • Patent number: 11018625
    Abstract: A frequency reference generator includes (i) an integrated frequency source having drive circuitry that drives a resonant (e.g., non-trimmable LC) tank to generate an oscillator signal, (ii) at least one temperature sensor that generates at least one measured temperature signal, and (iii) a frequency-adjustment circuit that adjusts the oscillator signal frequency to generate the frequency reference based on the measured temperature signal and a (e.g., sample-specific) mapping from temperature to a corresponding frequency-adjustment parameter (e.g., a divisor value for a fractional frequency divider). In some embodiments, a Colpitts oscillator generates the oscillator signal based on the measured temperature signal, where the Colpitts oscillator has voltage/temperature-compensation circuitry that compensates for variations in power supply voltage and operating temperature. Such frequency reference generators achieve substantial PVT insensitivity with as little as a single 1T-trim or even no trim at all.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: May 25, 2021
    Assignee: NXP B.V.
    Inventors: Alexander Sebastian Delke, Mark Stefan Oude Alink, Anne Johan Annema, Yanyu Jin, Jos Verlinden, Bram Nauta