Active Filter Patents (Class 327/552)
  • Patent number: 10914805
    Abstract: A signal error calibrating method is disclosed herein and includes following steps: filtering an error voltage in a sensor by a low pass filter in a calibration mode; converting the offset voltage to be a digital offset signal by an analog digital signal converter; converting the digital offset signal to be an offset calibrating signal by a digital analog signal converter; transmitting the offset calibrating signal to an input end of the sensor so as to offset an error voltage at the input end of the sensor. After calibrating the error voltage, the analog digital converter in the error calibrating circuit can be used for the need of signal output and the low pass filter is turned off at the same time.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: February 9, 2021
    Assignee: National Applied Research Laboratories
    Inventors: Chih-Yuan Yeh, Po-Chang Wu, Hann-Huei Tsai, Ying-Zong Juang
  • Patent number: 10838009
    Abstract: As one example, a filter apparatus includes an input to receive an electrical input signal. The filter apparatus includes a forward path connected between the input and an output of the filter apparatus. A feedback path is connected to provide feedback to the forward path based on an output signal at the output of the filter apparatus. A filter bypass is configured to provide the input signal directly to the output and to the feedback path for an activation phase of the filter apparatus. Diagnostics may also be performed.
    Type: Grant
    Filed: June 14, 2018
    Date of Patent: November 17, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Takao Oshida, Bryan Andrew Mueller
  • Patent number: 10778244
    Abstract: A correction method and a correction circuit for a sigma-delta modulator (SDM) are provided. The SDM includes a loop filter, a quantizer, and a digital-to-analog converter (DAC). The correction method includes the following steps: controlling the DAC not to receive the output of the quantizer; controlling the SDM to stop receiving signals; inputting a test signal to the DAC; converting the output of the loop filter to a digital signal; comparing the digital signal with a preset value; and adjusting the loop filter according to the result of comparing the digital signal and the preset value.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: September 15, 2020
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Chih-Lung Chen, Jie-Fan Lai, Yu-Chang Chen, Shih-Hsiung Huang
  • Patent number: 10749483
    Abstract: An amplifier device (14) is adapted for an antenna-like transducer for MRI applications, especially for an RF coil. The amplifier device (14) includes at least one amplifier channel (16) including: an input connection device (18) for connecting an RF signal source (12); an output connection device (20) for connecting the antenna-like RF transducer; an RF amplifier unit (22); and an impedance matching circuit (24) configured to adapt the coupling of the RF amplifier unit (22) to the actually connected antenna-like RF transducer with regard to an actual load of the amplifier device (14). The load results from the combination of the antenna-like RF transducer and a person or sample interacting with the antenna-like RF transducer. The impedance matching circuit (24) establishes an electric line (34) between the RF amplifier unit (22) and the antenna-like transducer with an adjustable line length.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: August 18, 2020
    Assignee: Koninklijke Philips N.V.
    Inventors: Christoph Leussler, Peter Vernickel
  • Patent number: 10727878
    Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) circuit. The multi-band RF circuit includes multiple antenna ports coupled to multiple antennas and an antenna swapping circuit coupled to the multiple antenna ports. Control circuitry in the multi-band RF circuit controls the antenna swapping circuit to selectively couple various transmit and/or receive filters with any one or more of the multiple antenna ports to support uplink carrier aggregation (ULCA) and/or multiple-input multiple-output (MIMO) operations with a minimum number of transmit and receive filters. Transmit filters of adjacent RF bands are physically separated, but disposed in proximity, in the multi-band RF circuit to help reduce intermodulation products between the adjacent RF bands during the ULCA operation. As a result, it is possible to improve RF performance of ULCA and MIMO operations, without increasing complexity, cost, and footprint of the multi-band RF circuit.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: July 28, 2020
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Marcus Granger-Jones
  • Patent number: 10715302
    Abstract: Technology for a channelization device of a wideband repeater is disclosed. The channelization device can include a first diplexer and a second diplexer. The channelization device can include a plurality of switchable signal paths between the first diplexer and the second diplexer operable to perform channelized passive filtering of signals in defined bands. The channelization device can include a plurality of switchable pass through signal paths between the first diplexer and the second diplexer operable to pass through signals in the defined bands without filtering of the signals. The channelization device can be configured to perform channelized passive filtering of signals with no amplification of the signals.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: July 14, 2020
    Assignee: WILSON ELECTRONICS, LLC
    Inventors: Glen Raggio, Chris Ashworth, Patrick Cook
  • Patent number: 10684495
    Abstract: The invention relates to an optical device, comprising: a lens having an adjustable focal length. According to the invention, a light source which is configured to emit light that is affected by said lens and impinges on at least a first photosensitive element, which is designed to generate a first output signal corresponding to the intensity of light impinging on it, wherein the first photosensitive element is configured to measure only a portion of the intensity distribution of said emitted light, and wherein the light source, the lens and the first photosensitive element are configured such that a change of the focal length of said lens changes the intensity distribution of the emitted light that impinges on the first photosensitive element, so that each focal length of the lens is associated to a specific first output signal generated by the first photosensitive element.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: June 16, 2020
    Assignee: OPTOTUNE AG
    Inventors: Manuel Aschwanden, David Niederer, Roman Patscheider, Daniel Borer, Christopher Laning, Michael Bueeler
  • Patent number: 10678886
    Abstract: This disclosure relates to systems and methods for analyzing sensor data using incremental autoregression techniques for generating a vector of autoregression coefficients is provided. The system processes a time series data to obtain blocks of observation values, reads the observation values, updates pre-stored convolution values with the observation values, updates a partial sum by adding each observation value to the partial sum, increments a count each time an observation value is read, repeats the steps of updates and increments until a last observation value from a last block is read to obtain an updated set of convolution values, partial sum, and count. The system further computes a first matrix and a second matrix using the updated set of convolutions values, or summation of observation values computed from the updated partial sum, or the updated count, and generates a vector of autoregression coefficients based on the first and the second matrix.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: June 9, 2020
    Assignee: Tata Consultancy Services Limited
    Inventors: Debnath Mukherjee, Suman Datta, Prateep Misra
  • Patent number: 10644814
    Abstract: One embodiment is directed to a device comprising one or more processing devices comprising an input and an output. The one or more processing devices are configured to receive an input signal via the input of the one or more processing devices. The one or more processing devices are further configured to apply a transfer function of a variable filter implemented via the one or more processing devices, the transfer function applied to the received input signal in order to generate a filtered signal, wherein application of the transfer function cancels, reduces, attenuates, or eliminates intermodulation byproducts of the input signal. The one or more processing devices are further configured to output the filtered signal via the output of the one or more processing devices.
    Type: Grant
    Filed: July 8, 2019
    Date of Patent: May 5, 2020
    Assignee: CommScope Technologies LLC
    Inventor: Nelson Christian Schmidt, Jr.
  • Patent number: 10637441
    Abstract: Polyphase gm-C filters can use matching gm cell components for improved higher image rejection results. Polyphase gm-C filter cells all can be matched by incorporating a matching gmu value in each of the gm components. The matching gmu value used to replace different gm values can be determined for incorporation into each gm cell component of a filter by: calculating coupling of gmi, gmij by gmi=Ci?0 and gmij=Czij?0 for i,j; calculating Ki=gmi/gmu; rounding Ki to an integer number, Ni=round(Ki), KiNi and Nij=round(Kij), KijNij; calculating a scaling factor for circuit capacitors Ci and Czijby ?i=(Ni?Ki)/Ki and ?ij=(Nij?Kij)/Kij; and adjusting circuit capacitors Ci and Czij by CiCi*(1+?i) and CzijCzij*(1+?ij). Once the process is completed for i,j, the result can be implemented to match gm cell components of traditional and newly designed polyphase gm-C filters with the matching gmu value.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: April 28, 2020
    Assignee: NXP B.V.
    Inventor: Siamak Delshadpour
  • Patent number: 10601429
    Abstract: Methods and systems for substantially simultaneously scan of two or more frequencies using one transceiver are discussed herein. For example, a listening device can include a controller configured to control its transceiver to alternate between two or more frequencies from two or more sets of frequencies. The controller is also configured to capture a portion of a preamble of a received signal to determine whether the received signal is intended for the listening device.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: March 24, 2020
    Assignee: Apple Inc.
    Inventors: Mik Cohen, Shahar Meir, Yuval Avner
  • Patent number: 10578470
    Abstract: A method evaluates a frequency spectrum representative of at least one time-dependent signal, the at least one time dependent signal being derived from an output from a measuring device under predetermined measuring device operating conditions. The time-dependent signal, includes a portion being representative of a wanted signal, and a portion being representative of noise. The method includes the steps of determining, based on the frequency spectrum of the signal, a value representative of the noise floor, identifying, based on the frequency spectrum of the signal derived under the predetermined operating condition, a peak component, and if the peak component satisfies a relative peak criterion determined on the basis of the determined value representative of the noise floor, determining the wanted signal by applying a predetermined algorithm. The invention further relates to a method for determining flow of a vortex measuring device, and a vortex sensor.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: March 3, 2020
    Assignee: GRUNDFOS HOLDING A/S
    Inventor: Ole Hartlev Pedersen
  • Patent number: 10560070
    Abstract: A filter circuit includes a filter and a current mode programmable gain amplifier, where the filter circuit is configured to filter an input signal to obtain an output signal. The filter is supplied with the input signal. The filter comprises at least one current extraction element configured to extract a first output current signal. The current mode programmable gain amplifier is configured to receive and amplify the first output current signal to obtain an amplified current signal. The output signal is derived from the amplified current signal.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: February 11, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Giuseppe Gramegna
  • Patent number: 10554232
    Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) front-end circuit. When a first antenna transmits an RF transmit signal in an RF transmit band, a second antenna may receive the RF transmit signal as an interference signal. The multi-band RF front-end circuit includes multiple receive filters for receiving an RF receive signal in multiple RF receive bands. A selected receive filter among the multiple receive filters is opportunistically reconfigured to help suppress the interference signal. Specifically, a bandpass bandwidth of the selected receive filter is expanded to include at least a portion of the RF spectrum of the interference signal. By doing so, it is possible to shunt the interference signal to a ground through the selected receive filter. As a result, it is possible to reduce an adverse impact of the interference signal to improve RF performance of the multi-band RF front-end circuit.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: February 4, 2020
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Marcus Granger-Jones
  • Patent number: 10483948
    Abstract: A RC oscillator comprises a resistor unit. The resistor unit can comprise at least one set of compensation resistor. Each set of compensation resistor comprises a positive temperature coefficient resistor and a negative temperature coefficient resistor coupled in series with the positive temperature coefficient resistor.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: November 19, 2019
    Assignee: Johnson Electric International AG
    Inventors: Chiping Sun, Ken Wong, Huimin Guo, Yat Tung Lai, Shujuan Huang
  • Patent number: 10482783
    Abstract: A simulator assistance method and system adaptively mitigates Pilot Induced Oscillations (PIOs) with respect to axes of rotation about the vehicle's center of mass. The method detects PIOs in a body rate signal by band pass filtering the body rate signal, and provides an adaptive response based on the amplitude of the body rate signal within the frequency band.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: November 19, 2019
    Assignee: Frasca International, Inc.
    Inventor: Glen Dimock
  • Patent number: 10476534
    Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) circuit. The multi-band RF circuit includes multiple antenna ports coupled to multiple antennas and an antenna swapping circuit coupled to the multiple antenna ports. Control circuitry in the multi-band RF circuit controls the antenna swapping circuit to selectively couple various transmit and/or receive filters with any one or more of the multiple antenna ports to support uplink carrier aggregation (ULCA) and/or multiple-input multiple-output (MIMO) operations with a minimum number of transmit and receive filters. Transmit filters of adjacent RF bands are physically separated, but disposed in proximity, in the multi-band RF circuit to help reduce intermodulation products between the adjacent RF bands during the ULCA operation. As a result, it is possible to improve RF performance of ULCA and MIMO operations, without increasing complexity, cost, and footprint of the multi-band RF circuit.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: November 12, 2019
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Marcus Granger-Jones
  • Patent number: 10454272
    Abstract: An electronic device and a method for filtering common mode disturbances from a power electronic device are disclosed. In an embodiment the device includes a first capacitor coupled in series to a first one-way conductor, the first one-way conductor allowing current flow in one direction, wherein the first one-way conductor and the first capacitor are coupled between a load node and a reference potential and a second capacitor coupled in series to a second one-way conductor, the second one-way conductor allowing current flow in an opposite direction, wherein the second one-way conductor and the second capacitor are coupled between the load node and the reference potential. The device further includes a third capacitor being coupled between the load node and the reference potential, a first switch bypassing the first one-way conductor and a second switch bypassing the second one-way conductor.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: October 22, 2019
    Assignee: EPCOS AG
    Inventor: Andrew Tucker
  • Patent number: 10436726
    Abstract: A palm-size portable ?NMR relaxometer system for performing multi-step multi-sample chemical/biological assays, comprising a PCB having a CMOS ?NMR transceiver and a DMF device integrated thereon. A portable magnet has an inner gap configured to at least partially receive the DMF device. The DMF device comprises a platform of electrodes including a sensing site and receives one or more samples for analysis at an electrode and automatically transports the one or more samples on individual paths sequentially to the sensing site, for performing sensing on each sample sequentially. A Butterfly coil disposed on the PCB and underneath the DMF device and is at least partially received in the inner gap. The Butterfly coil excites the sample at the ?NMR sensing site by transducing a magnetic field produced at the sensing site to an electrical signal which is processed by the CMOS ?NMR transceiver to produce an analytical signal.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: October 8, 2019
    Assignee: UNIVERSITY OF MACAU
    Inventors: Ka-Meng Lei, Pui-In Mak, Man-Kay Law, Rui Paulo Da Silva Martins
  • Patent number: 10425062
    Abstract: Provided is a polyphase filter, which is capable of achieving amplitude matching and phase matching while achieving a low insertion loss with a single-stage configuration. A first variable resistor and a second variable resistor have resistance values that are equal to each other, and the resistance values are set so as to correct an amplitude error between orthogonal signals of outputs of a first output terminal to a fourth output terminal. A first variable capacitor, a second variable capacitor, a third variable capacitor, and a fourth variable capacitor have capacitance values that are equal to one another, and the capacitance values are set so as to correct a phase error between the orthogonal signals of the outputs of the first output terminal to the fourth output terminal.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: September 24, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Atsushi Kato, Eiji Taniguchi, Takaya Maruyama, Takanobu Fujiwara, Koji Tsutsumi
  • Patent number: 10355669
    Abstract: A filtering unit is presented. The filtering unit includes at least two operational amplifiers, where each of the at least two operational amplifiers includes an input end and an output end, where the input end of one operational amplifier is coupled across the corresponding input end of another operational amplifier of the at least two operational amplifiers. The filtering unit also includes a direct current link operatively coupled to the at least two operational amplifiers and at least one thermoelectric module, where each thermoelectric module includes a conducting layer, where the direct current link and at least one of the at least two operational amplifiers are operatively coupled to the at least one thermoelectric module. A filtering system is also presented.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: July 16, 2019
    Assignee: General Electric Company
    Inventors: Ruxi Wang, Satish Prabhakaran, Feng Chen, Di Zhang
  • Patent number: 10348528
    Abstract: A system includes: a baseband phase generator configured to receive differential in-phase (I) and quadrature (Q) signals and configured to output N phase-shifted baseband signals, wherein N is greater than 4, further wherein the baseband phase generator comprises a plurality of notch filters configured to receive the I and Q signals; and an upconverter configured to receive the phase-shifted baseband signals, to perform mixing on the phase-shifted baseband signals, and to output a differential upconverted signal.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: July 9, 2019
    Assignee: QUALCOMM Incorporation
    Inventors: Ayush Mittal, Bhushan Shanti Asuri, Krishnaswamy Thiagarajan, Sameer Vasantlal Vora, Mahim Ranjan
  • Patent number: 10340893
    Abstract: A method for compensating the bandedge ripple of an analog filter, using a circuit comprising a low pass filter is described. The method comprises receiving, at the analog filter, a plurality of tones of different frequencies from a tone generator, measuring, an amplitude of each tone in the plurality of tones after each tone is processed by the analog filter, storing the measured amplitudes and frequencies in a database, measuring a bandedge ripple by measuring a difference in amplitude between a first tone and a second tone from the plurality of tones, and selecting a low pass filter, from a plurality of low pass filters, based on the measured difference.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: July 2, 2019
    Assignee: Marvell International Ltd.
    Inventor: Vijay Ahirwar
  • Patent number: 10340890
    Abstract: A high order filter circuit is integrated by a plurality of the low order filter circuits. Before correcting the high order filter circuit, switch units may restore the high order filter circuit to the low order filter circuits for correction, and then combine the corrected low order filter circuits to form the original high order filter circuit.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: July 2, 2019
    Assignees: NUVOTON TECHNOLOGY CORP., NCKU RESEARCH & DEVELOPMENT FOUNDATION
    Inventors: Shuenn-Yuh Lee, Sz-An Chen
  • Patent number: 10333481
    Abstract: According to one mode of the inventive concept, an amplification device includes a first amplifier configured to amplify an input multi-band signal to a first level, a separating unit configured to separate the multi-band signal having the first level into a first band signal and a second band signal, and a second amplifier configured to amplify the second band signal to a second level.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: June 25, 2019
    Assignee: SOLiD, INC.
    Inventor: Hwansun Lee
  • Patent number: 10312869
    Abstract: There is described herein methods and devices for high DC gain closed loop operation amplifiers exploiting cascaded low gain stages and a controller-based compensation circuit for stability.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: June 4, 2019
    Assignee: THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING / MCGILL UNIVERSITY
    Inventors: Gordon Roberts, Ming Yang
  • Patent number: 10291195
    Abstract: The present invention provides methods and systems for digitally processing audio signals. Some embodiments receive an audio signal and converting it to a digital signal. The gain of the digital signal may be adjusted a first time, using a digital processing device located between a receiver and a driver circuit. The adjusted signal can be filtered with a first low shelf filter. The systems and methods may compress the filtered signal with a first compressor, process the signal with a graphic equalizer, and compress the processed signal with a second compressor. The gain of the compressed signal can be adjusted a second time. These may be done using the digital processing device. The signal may then be output through an amplifier and driver circuit to drive a personal audio listening device. In some embodiments, the systems and methods described herein may be part of the personal audio listening device.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: May 14, 2019
    Assignee: BONGIOVI ACOUSTICS LLC
    Inventors: Anthony Bongiovi, Phillip Fuller, Glenn Zelniker
  • Patent number: 10263568
    Abstract: A linearized power amplifier apparatus includes a number of amplifying stages to amplify a radio-frequency (RF) signal, and a feedback loop including a feedback circuit coupled between an output port of a last amplifying stage and an input port of a first amplifying stage. The feedback loop has a loop gain frequency response that peaks at a frequency approximately equal to a frequency of the RF signal. The feedback loop can provide a linear combination of a feedback signal and the RF signal to the input port of the first amplifying stage.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: April 16, 2019
    Assignee: Avaga Technologies International Sales PTE. Limited
    Inventor: Jeffrey Norwood Harrison
  • Patent number: 10212380
    Abstract: Disclosed are a pixel acquisition circuit, an image sensor, and an image acquisition system. The pixel acquisition circuit includes a photodetection unit, filter-amplification unit, sample and hold unit, and activation control unit. The photodetection unit outputs a first electrical signal corresponding to a light signal illuminating thereon. The filter-amplifier unit is connected to the photodetector, and amplifies and filters out the signal component below a frequency threshold on the first electrical signal, to output a second electrical signal. A threshold comparison unit determines whether the second electrical signal is greater than a first threshold and/or less than a second threshold and, if so, generates an activation instruction signal. In response to receiving an activation instruction signal, the activation control unit instructs the sample and hold unit to acquire and buffer the first electrical signal, and sends a transmission request to an interface bus connected to the sample and hold unit.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: February 19, 2019
    Assignee: CELEPIXEL TECHNOLOGY CO. LTD
    Inventor: Shoushun Chen
  • Patent number: 10211811
    Abstract: The disclosure relates to a tunable filter. The tunable filter includes: a filter input; a filter output; at least one feedback loop coupled between the filter output and the filter input, where the at least one feedback loop includes at least one tunable feedback capacitance which is configured to tune a cut-off frequency of the tunable filter; and an active element, coupled between the filter input and the filter output and configured to drive the at least one tunable feedback capacitance, the active element having a transfer function with a primary pole and at least one secondary pole, where the active element includes a first stabilization element that is coupled to a first internal node of the active element.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: February 19, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Giuseppe Gramegna
  • Patent number: 10187097
    Abstract: The present technology relates to a notch filter capable of easily obtaining a desired frequency characteristic. In an N-path filter unit, any one of a plurality of N capacitors is selected as a signal path through which a signal passes, so that the capacitor serving as the signal path is temporally switched. A plurality of N-path filter units is cascade-connected and a capacitor is inserted to a connection point between the N-path filter units. The present technology may be applied to the notch filter which eliminates a blocker and the like, for example.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: January 22, 2019
    Assignee: Sony Corporation
    Inventor: Sachio Iida
  • Patent number: 10181316
    Abstract: A maximum noise suppression level (Gmin) is not a single constant value for an entire frequency range, but is allowed to vary across frequencies. The amount of variation is dynamically computed based on the input noise characteristics. For example, if there is excess noise in the lower frequency region, the maximum noise suppression level in that region will increase to suppress the noise in that frequency region. This feature can be enabled all the time, and will be active when the input conditions warrant extra noise suppression in a particular frequency region. Thus, the effort involved in manually tuning an audio system (e.g., hands-free telephony, voice-controlled automotive head unit, etc.) can be significantly reduced or eliminated.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: January 15, 2019
    Assignee: Continental Automotive Systems, Inc.
    Inventors: Matthew R. Kirsch, Guillaume Lamy, Bijal Joshi
  • Patent number: 10177743
    Abstract: An inductive synthesis circuit that mimics an ideal inductor over a wide range of inductance values, from less than 1 mH to more than 100 H, can be used in place of an inductor in any electrical circuit. One application of a synthesized inductor is in an integrated circuit in which it is impractical to construct a coil of wire. The inductive synthesis circuit is suitable for use in a calibration instrument for testing an inductance meter. The inductive synthesis circuit, together with a resistive synthesis circuit and a capacitive synthesis circuit, can be used to calibrate a multi-meter. Alternatively, the inductive synthesis circuit can be used to mimic an ideal inductor in a filter circuit that includes an inductor component, such as a high pass filter, a notch filter, or a band pass filter.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: January 8, 2019
    Assignee: Fluke Corporation
    Inventor: William J. Britz
  • Patent number: 10177750
    Abstract: For example, an averaging circuit includes first to third capacitors and a controller. The controller causes a first first-stage average voltage to be applied to a first capacitor, the first first-stage average voltage being an average of a first voltage applied to the first capacitor and a second voltage applied to a second capacitor, causes a second first-stage average voltage to be applied to the second capacitor, the second first-stage average voltage being an average of a third voltage applied to the second capacitor and a fourth voltage applied to a third capacitor, and causes a first second-stage average voltage to be applied to the first capacitor, the first second-stage average voltage being an average of the first and second first-stage average voltages applied to the first and second capacitors.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: January 8, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Sungjun Lee, Makoto Takamiya, Takayasu Sakurai
  • Patent number: 10171067
    Abstract: A waveform shaping filter according to an embodiment includes at least one filter stage and a control circuit. The filter stage includes a differentiation signal generation circuit, a proportional signal generation circuit, and an adder circuit. The differentiation signal generation circuit generates a differentiation signal obtained by amplifying a differentiation component of an input signal. The proportional signal generation circuit generates a proportional signal obtained by amplifying the input signal. The adder circuit outputs an output signal obtained by adding the proportional signal and the differentiation signal. The control circuit compares the output signal and a first detection level, detects at least one of an overshoot and an undershoot of the output signal, and controls a time constant of the filter stage, based on a detection result.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: January 1, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsuro Itakura, Masanori Furuta, Shunsuke Kimura, Hideyuki Funaki, Go Kawata, Hirokatsu Shirahama
  • Patent number: 10164610
    Abstract: A signal output device is provided in a communication apparatus. The communication apparatus communicates with a different one of the communication apparatus using a single line. The signal output device includes a signal output unit. The signal output unit includes a first filter and a second filter. The first filter is provided by a Bessel filter. The second filter is provided by a Chebyshev filter or a Butterworth filter. The signal output unit outputs a signal which is obtained by passing a predetermined signal through the first filter and the second filter. The signal output from the signal output unit has a pass characteristic of the first filter and a pass characteristic of the second filter. A cutoff frequency of the first filter is set to be lower than a cutoff frequency of the second filter.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: December 25, 2018
    Assignee: DENSO CORPORATION
    Inventors: Takasuke Ito, Shigeki Otsuka, Kazuyoshi Nagase
  • Patent number: 10153267
    Abstract: An ESD-protective-function-equipped composite electronic component is provided that includes multiple Zener diodes formed from first and second semiconductor layers. Moreover, the second semiconductor layers are disposed on an insulating substrate and in the same plane. The electronic component includes electrodes extending from each of the Zener diodes and one or more thin-film circuit element connected in series between a pair of the electrodes.
    Type: Grant
    Filed: January 11, 2017
    Date of Patent: December 11, 2018
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Masanobu Nomura, Yutaka Takeshima
  • Patent number: 10148294
    Abstract: Embodiments of the disclosure include a multi-band radio frequency (RF) front-end circuit. When a first antenna transmits an RF transmit signal in an RF transmit band, a second antenna may receive the RF transmit signal as an interference signal. The multi-band RF front-end circuit includes multiple receive filters for receiving an RF receive signal in multiple RF receive bands. A selected receive filter among the multiple receive filters is opportunistically reconfigured to help suppress the interference signal. Specifically, a bandpass bandwidth of the selected receive filter is expanded to include at least a portion of the RF spectrum of the interference signal. By doing so, it is possible to shunt the interference signal to a ground through the selected receive filter. As a result, it is possible to reduce an adverse impact of the interference signal to improve RF performance of the multi-band RF front-end circuit.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: December 4, 2018
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Marcus Granger-Jones
  • Patent number: 10135423
    Abstract: An apparatus and method for continuously shifting the phase of an input signal includes a quadrature hybrid having an input/output port for receiving an input radio frequency (RF) signal and outputting a phase shifted RF signal. An analog shifting unit is connected to the quadrature hybrid for performing an intermediate phase shift on the input RF signal. An additional analog shifting unit is connected to an isolation port of the quadrature hybrid to receive an intermediate output signal based on the intermediate phase shift, and shifting a phase of the intermediate output signal to produce an intermediate input signal. The analog shifting unit performs a final phase shift of the intermediate input signal and the final phase shifted intermediate input signal is output, at the input/output port, as the phase shifted RF signal.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: November 20, 2018
    Assignee: HUGHES NETWORK SYSTEMS, LLC
    Inventors: Bingqian Lu, Hamad Alsawaha, Peter Hou, Thomas Jackson, Yilin Mao
  • Patent number: 10090872
    Abstract: A signal processing method for estimating a frequency domain representation of signal from a series of samples distorted by an instrument function, the method comprising obtaining the series of samples; obtaining a set of coefficients that fit a set of basis functions to a complex exponential function wherein the set of basis functions comprises a plurality of basis functions each defined by a shifted version of the instrument function in a signal domain; estimating the frequency domain representation of the signal based on the series of samples and the coefficients. This is wherein the estimate of the instrument function is based on a characterization of the instrument function in the frequency domain at frequencies associated with the complex exponential function.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: October 2, 2018
    Assignees: IMPERIAL INNOVATIONS LIMITED, THE CHINESE UNIVERSITY OF HONG KONG
    Inventors: Jose Antonio Uriguen, Pier Luigi Dragotti, Thierry Albert Jean-Louis Blu
  • Patent number: 10050523
    Abstract: The embodiment of the present disclosure provides a voltage conversion circuit including a voltage conversion module and a control module, the voltage conversion module includes a input terminal, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first switch to thirteenth switch and a output terminal, the input terminal is used to connect the input power, the control module is connected with the voltage conversion module, the voltage conversion module is used to convert the voltage of the input power to different magnifications output voltage and output from the output terminal when the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are charging and discharging. Further, the embodiment of the present disclosure further provides a liquid crystal display driving chip applied the voltage conversion circuit. The voltage conversion circuit may achieve multi-magnification voltage output, and improve the conversion efficiency of the voltage.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: August 14, 2018
    Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd
    Inventors: Feilin Ji, Xiaoping Tan
  • Patent number: 9966915
    Abstract: A programmable amplifier includes an amplifier, an input capacitor, a feedback circuit, and a high-pass filter circuit. The amplifier has an input coupled to the input capacitor for receiving an input signal. The feedback circuit includes multiple feedback capacitors of differing capacitance values that are each selectively coupled between the output of the amplifier and the input of the amplifier using multiple first switches. The high-pass filter circuit includes multiple switched capacitors of differing capacitance values that are each selectively coupled between the amplifier output and a ground node using multiple second switches. The first switches are configured to be selectively switched on for activating at least one feedback capacitor to adjust a gain of the amplifier, while the second switches are configured to be selectively switched at a first and second phase of a clock signal to adjust a high-pass cutoff frequency of the amplifier independently of how the gain is adjusted.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: May 8, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Abdullah Ahmed, Frederick Edward Sykes
  • Patent number: 9961291
    Abstract: Disclosed are a pixel acquisition circuit, an image sensor, and an image acquisition system. The pixel acquisition circuit includes a photodetection unit, filter-amplification unit, sample and hold unit, and activation control unit. The photodetection unit outputs a first electrical signal corresponding to a light signal illuminating thereon. The filter-amplifier unit is connected to the photodetector, and amplifies and filters out the signal component below a frequency threshold on the first electrical signal, to output a second electrical signal. A threshold comparison unit determines whether the second electrical signal is greater than a first threshold and/or less than a second threshold and, if so, generates an activation instruction signal. In response to receiving an activation instruction signal, the activation control unit instructs the sample and hold unit to acquire and buffer the first electrical signal, and sends a transmission request to an interface bus connected to the sample and hold unit.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: May 1, 2018
    Assignee: CELEPIXEL TECHNOLOGY CO. LTD
    Inventor: Shoushun Chen
  • Patent number: 9960866
    Abstract: A method and apparatus are provided. The method includes receiving a signal sequence and a noise sequence, determining a first absolute value sum approximation of a receive power of the signal sequence, determining a second absolute value sum approximation of a noise power of the noise sequence, and determining a signal-to-noise ratio (SNR) based on the first absolute value sum approximation and the second absolute value sum approximation.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: May 1, 2018
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Binnan Zhuang, Hongbing Cheng, Jungwon Lee
  • Patent number: 9948236
    Abstract: A method includes forming a resonator comprising a plurality of switched impedances spatially distributed within the resonator, selecting a resonant frequency for the resonator, and distributing two or more transconductance elements within the resonator based on the selected resonant frequency. Distributing the two or more transconductance elements may include non-uniformly distributing the two or more transconductance elements within the resonator.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: April 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Mark A. Ferriss, Daniel J. Friedman, Alexander V. Rylyakov, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • Patent number: 9948235
    Abstract: A method includes forming a resonator comprising a plurality of switched impedances spatially distributed within the resonator, selecting a resonant frequency for the resonator, and distributing two or more transconductance elements within the resonator based on the selected resonant frequency. Distributing the two or more transconductance elements may include non-uniformly distributing the two or more transconductance elements within the resonator.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: April 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Mark A. Ferriss, Daniel J. Friedman, Alexander V. Rylyakov, Bodhisatwa Sadhu, Alberto Valdes Garcia
  • Patent number: 9893692
    Abstract: A circuit comprises a Sallen-Key filter, which includes a source follower that implements a unity-gain amplifier; and a programmable-gain amplifier coupled to the Sallen-Key filter. The circuit enables programmable gain via adjustment to a current mirror copying ratio in the programmable-gain amplifier, which decouples the bandwidth of the circuit from its gain settings. The programmable-gain amplifier can comprise a differential voltage-to-current converter, a current mirror pair, and programmable output gain stages. The Sallen-Key filter and at least one branch in the programmable-gain amplifier can comprise transistors arranged in identical circuit configurations.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: February 13, 2018
    Assignee: Tensorcom, Inc.
    Inventors: Zaw Soe, Kevin Jing, Steve Gao
  • Patent number: 9887636
    Abstract: A method of reducing common mode current that flows between an internal ground of an electrical circuit and an Earth ground, the electrical circuit is supplied by an electrical network delivering an alternating voltage. The method includes applying a voltage by the electrical network between the internal ground of the circuit and the Earth ground and applying an additional voltage between the internal ground of the circuit and the Earth ground using an electronic component interposed between the internal ground of the circuit and Earth ground, this additional voltage opposing the voltage applied by the electrical network between the internal ground and the Earth ground so as to reduce the common mode current at the frequency of the electrical network.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: February 6, 2018
    Assignee: Valeo Systemes de Controle Moteur
    Inventor: Pierre Sardat
  • Patent number: 9859862
    Abstract: Techniques to maintain gain flatness in the frequency response of a passband signal over a circuit chain. The techniques may be employed in the receive chain of a millimeter wave band wireless receiver, in the transmit chain of a millimeter wave band wireless transmitter, or in both the receive chain and the transmit chain of a millimeter wave band wireless transceiver. The techniques include mismatching the input and output impedance of a passive low pass filter used in the chain to peak the gain of the passband signal at or near the cutoff frequency (Fc) of the filter.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: January 2, 2018
    Assignees: ADVANCED MICRO DEVICES, INC., AMD FAR EAST LTD.
    Inventors: Natalino Camilleri, Fan Zhang
  • Patent number: 9793872
    Abstract: The present invention provides methods and systems for digitally processing audio signals. Some embodiments receive an audio signal and converting it to a digital signal. The gain of the digital signal may be adjusted a first time, using a digital processing device located between a receiver and a driver circuit. The adjusted signal can be filtered with a first low shelf filter. The systems and methods may compress the filtered signal with a first compressor, process the signal with a graphic equalizer, and compress the processed signal with a second compressor. The gain of the compressed signal can be adjusted a second time. These may be done using the digital processing device. The signal may then be output through an amplifier and driver circuit to drive a personal audio listening device. In some embodiments, the systems and methods described herein may be part of the personal audio listening device.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: October 17, 2017
    Assignee: Bongiovi Acoustics LLC
    Inventors: Anthony Bongiovi, Phillip Fuller, Glenn Zelniker