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公开(公告)号：US20200292602A1
公开(公告)日：2020-09-17
申请号：US16890727
申请日：2020-06-02
Inventor： Amar VELLANKI , Zhong YOU , Johann G. GABORIAU
Abstract: A method for measuring a capacitive sensor output may include applying an excitation signal to a capacitor of the capacitive sensor which causes generation of a modulated signal from a baseband signal, wherein the excitation signal is of a carrier frequency which is higher than frequency content of the baseband signal, demodulating the modulated signal to generate an intermediate signal representative of a capacitance of the capacitor wherein the demodulating is based, at least in part, on the excitation signal, converting the intermediate signal into a pulse-density modulated output signal with a pulse-density modulator, and shaping a noise transfer function of the pulse-density modulator to have an approximate zero at the carrier frequency.
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公开(公告)号：US20200343871A1
公开(公告)日：2020-10-29
申请号：US16928444
申请日：2020-07-14
Inventor： Johann G. GABORIAU , David M. OLIVENBAUM , Xiaofan FEI , Amar VELLANKI , Venugopal CHOUKINISHI , Gautham SIVASANKAR , Wai-Shun SHUM
Abstract: A method for calibrating gain in a multi-path subsystem having a first processing path, a second processing path, and a mixed signal return path, may include low-pass filtering an input signal and a mixed signal return path signal generated from the input signal at subsonic frequencies to generate a filtered input signal and a filtered mixed signal return path signal and tracking and correcting for a gain difference between the first processing path and the second processing path based on the filtered input signal and the filtered mixed signal return path signal.
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3.发明公开公开(公告)号：US20230379592A1
公开(公告)日：2023-11-23
申请号：US18318896
申请日：2023-05-17
Inventor： Wai-Shun SHUM , Amar VELLANKI , Jeffrey SKARZYNSKI , Gautham S. SIVASANKAR , Xingdong DAI , Venugopal CHOUKINISHI , Xiaofan FEI , Xin ZHAO
IPC: H04N23/90
CPC classification number: H04N23/90
Abstract: A system for relaying communication for a PHY/data link level communication protocol may include a first device having a first and second transceiver, the first transceiver having a first protocol controller configured to detect a first bus condition and second transceiver having a second protocol controller configured to detect a second bus condition and a switching matrix coupled to the first and second transceiver and configured to operate in a relaying mode to enable: the first protocol controller to control a physical layer of the second transceiver and enables the second protocol controller to control a physical layer of the first transceiver, a physical layer of a first transmitter of the first transceiver to receive an output of a second receiver of the second transceiver, and the physical layer of a second transmitter of the second transceiver to receive an output of a first receiver of the first transceiver.
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公开(公告)号：US20190115909A1
公开(公告)日：2019-04-18
申请号：US16219187
申请日：2018-12-13
Inventor： Tejasvi DAS , Alan Mark MORTON , Xin ZHAO , Lei ZHU , Xiaofan FEI , Johann G. GABORIAU , John L. MELANSON , Amar VELLANKI
CPC classification number: H03K7/08 , G06F1/025 , H02M3/157 , H02M2001/0012 , H03F3/183 , H03F3/2175
Abstract: A system may include a digital pulse width modulator subsystem, a first path coupled to an output of the digital pulse width modulator subsystem and configured to drive an open-loop driver stage, a second path coupled to the output of the digital pulse width modulator subsystem and configured to drive a closed-loop analog pulse width modulator, a controller to select between the first path and the second path for processing a signal based on one or more characteristics of the signal, and a calibration subsystem configured to calibrate at least one of a first gain of the first path and a second gain of the second path in order that the first gain and the second gain are at least approximately equal at the time of switching selection between the first path and the second path or vice versa, in order to minimize artifacts due to the switching.
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公开(公告)号：US20190056440A1
公开(公告)日：2019-02-21
申请号：US15926734
申请日：2018-03-20
Inventor： Amar VELLANKI , Zhong YOU , Johann G. GABORIAU
Abstract: A method for measuring a capacitive sensor output may include applying an excitation signal to a capacitor of the capacitive sensor which causes generation of a modulated signal from a baseband signal, wherein the excitation signal is of a carrier frequency which is higher than frequency content of the baseband signal, demodulating the modulated signal to generate an intermediate signal representative of a capacitance of the capacitor wherein the demodulating is based, at least in part, on the excitation signal, converting the intermediate signal into a pulse-density modulated output signal with a pulse-density modulator, and shaping a noise transfer function of the pulse-density modulator to have an approximate zero at the carrier frequency.
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Patent Agency Ranking
公开(公告)号：US20240187205A1
公开(公告)日：2024-06-06
申请号：US18471856
申请日：2023-09-21
Inventor： Jeffrey SKARZYNSKI , Wai-Shun SHUM , Amar VELLANKI , Venugopal CHOUKINISHI , Xin ZHAO , John L. MELANSON
CPC classification number: H04L7/033 , H04J3/0688
Abstract: A system may include a plurality of devices coupled to one another via a shared digital wired communication link, the plurality of devices comprising a first device configured to periodically transmit a synchronization packet onto the shared digital wired communication link to synchronize other of the plurality of devices to a reference clock of the first device, a second device configured to receive the synchronization packet and transmit one or more first data packets onto the shared digital wired communication link in response to the synchronization packet, and a third device configured to receive the synchronization packet and transmit one or more second data packets onto the shared digital wired communication link in response to the synchronization packet and the one or more second data packets.
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公开(公告)号：US20200228079A1
公开(公告)日：2020-07-16
申请号：US16828401
申请日：2020-03-24
Inventor： Amar VELLANKI , Tejasvi DAS , John L. MELANSON
Abstract: A multi-path subsystem may include a first processing path, a second processing path, a mixed signal return path, and a calibration engine configured to: estimate and cancel a direct current (DC) offset of the mixed signal return path, estimate and cancel a DC offset between the first processing path and the second processing path, estimate and cancel a phase difference between the first processing path and a sum of the second processing path and the mixed signal return path, estimate and cancel a return path gain of the mixed signal return path, and track and correct for a gain difference between the first processing path and the second processing path.
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公开(公告)号：US20190257866A1
公开(公告)日：2019-08-22
申请号：US16121259
申请日：2018-09-04
Inventor： Gautham S. SIVASANKAR , Tejasvi DAS , Emmanuel MARCHAIS , Amar VELLANKI , Leyi YIN , John L. MELANSON , Venugopal CHOUKINISHI
Abstract: A method of determining a phase misalignment between a first signal generated from a first signal path and a second signal generated from a second signal path may include obtaining multiple samples of the first signal proximate to when the first signal crosses zero wherein the first signal can be approximated as linear; obtaining multiple samples of the second signal proximate to when the second signal crosses zero wherein the first signal can be approximated as linear; based on the multiple samples of the first signal, approximating a first time at which the first signal crosses zero; based on the multiple samples of the second signal, approximating a second time at which the second signal crosses zero; and determining the phase misalignment between the first signal and the second signal based on a difference between the first time and the second time.
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9.发明申请公开(公告)号：US20190137300A1
公开(公告)日：2019-05-09
申请号：US15926758
申请日：2018-03-20
Inventor： Amar VELLANKI , Vamsikrishna PARUPALLI , Emmanuel MARCHAIS , Zhong YOU
Abstract: A method may include receiving an analog modulated signal generated from a baseband signal modulated with a carrier signal wherein the baseband signal is representative of a capacitance of a capacitive sensor, converting the analog modulated signal into an equivalent digital modulated signal, demodulating the digital modulated signal to generate a demodulated digital signal representative of the capacitance of the capacitor wherein the demodulating is based, at least in part, on the carrier signal, and converting the demodulated digital signal into a digital output signal representative of a displacement of a plate of the capacitive sensor or a rate of displacement of a plate of the capacitive sensor.
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公开(公告)号：US20230366747A1
公开(公告)日：2023-11-16
申请号：US18191733
申请日：2023-03-28
Inventor： Vamsikrishna PARUPALLI , Zhong YOU , Johann G. GABORIAU , Amar VELLANKI , Vikrant ARUMUGAM
CPC classification number: G01K7/22 , H03M1/1014 , G01K2219/00
Abstract: A current digital-to-analog converter may be used in a system for measuring temperature of a thermistor, with mismatch reduction techniques applied to digital-to-analog converter elements of the digital-to-analog converter in order to maximize accuracy and precisions of the temperature measurement.
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