Patents by Inventor Sriraman Dakshinamurthy
Sriraman Dakshinamurthy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11821731Abstract: Facilitating minimization of non-linearity effects of a delay of a capacitance-to-voltage (C2V) converter on an output of a gyroscope is presented herein. A sense output signal of a sense mass of the gyroscope and a drive output signal of a drive mass of the gyroscope are electronically coupled to respective analog-to-digital converter (ADC) inputs of bandpass sigma-delta ADCs of the gyroscope. The bandpass sigma-delta ADCs include respective C2V converters that are electronically coupled, via respective feedback loops, to the respective ADC inputs to facilitate reductions of respective propagation delays of the bandpass sigma-delta ADCs. Respective ADC outputs of the bandpass sigma-delta ADCs are electronically coupled to demodulator inputs of a demodulator of the gyroscope that transforms the sense output into an output of the MEMS gyroscope representing an external stimulus that has been applied to the sense mass.Type: GrantFiled: August 11, 2021Date of Patent: November 21, 2023Assignee: INVENSENSE, INC.Inventors: Carlo Pinna, Sriraman Dakshinamurthy
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Patent number: 11754397Abstract: Microelectromechanical systems (MEMS) gyroscopes and related sense frequency tracking techniques are described. Various embodiments facilitate sense frequency tracking and offset and/or sensitivity change compensation. Exemplary embodiments can comprise receiving a sense signal at an output of a MEMS gyroscope and determining a sense resonant frequency of the sense signal. In addition, exemplary methods can comprise generating an input sine wave with a frequency of the sense resonant frequency of the sense signal injecting the input sine wave into the MEMS gyroscope, to facilitate sense frequency tracking.Type: GrantFiled: May 11, 2021Date of Patent: September 12, 2023Assignee: INVENSENSE, INC.Inventors: Sriraman Dakshinamurthy, Carlo Pinna, Ronak Chetan Desai
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Patent number: 11466986Abstract: Microelectromechanical systems (MEMS) gyroscopes and related sense frequency tracking techniques are described. Various embodiments facilitate sense frequency tracking and offset and/or sensitivity change compensation. Exemplary embodiments can comprise receiving a sense signal at an output of a MEMS gyroscope and determining a sense resonant frequency of the sense signal. In addition, exemplary methods can comprise generating an input sine wave with a frequency of the sense resonant frequency of the sense signal injecting the input sine wave into the MEMS gyroscope, to facilitate sense frequency tracking.Type: GrantFiled: December 14, 2018Date of Patent: October 11, 2022Assignee: INVENSENSE, INC.Inventors: Sriraman Dakshinamurthy, Carlo Pinna, Ronak Chetan Desai
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Patent number: 11287443Abstract: A MEMS accelerometer includes a suspended spring-mass system that has a frequency response to accelerations experienced over a range of frequencies. The components of the suspended spring-mass system such as the proof masses respond to acceleration in a substantially uniform manner at frequencies that fall within a designed bandwidth for the MEMS accelerometer. Digital compensation circuitry compensates for motion of the proof masses outside of the designed bandwidth, such that the functional bandwidth of the MEMS accelerometer is significantly greater than the designed bandwidth.Type: GrantFiled: February 19, 2020Date of Patent: March 29, 2022Assignee: INVENSENSE, INC.Inventors: Sriraman Dakshinamurthy, Vadim Tsinker, Matthew Julian Thompson
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Publication number: 20220057207Abstract: Facilitating minimization of non-linearity effects of a delay of a capacitance-to-voltage (C2V) converter on an output of a gyroscope is presented herein. A sense output signal of a sense mass of the gyroscope and a drive output signal of a drive mass of the gyroscope are electronically coupled to respective analog-to-digital converter (ADC) inputs of bandpass sigma-delta ADCs of the gyroscope. The bandpass sigma-delta ADCs include respective C2V converters that are electronically coupled, via respective feedback loops, to the respective ADC inputs to facilitate reductions of respective propagation delays of the bandpass sigma-delta ADCs. Respective ADC outputs of the bandpass sigma-delta ADCs are electronically coupled to demodulator inputs of a demodulator of the gyroscope that transforms the sense output into an output of the MEMS gyroscope representing an external stimulus that has been applied to the sense mass.Type: ApplicationFiled: August 11, 2021Publication date: February 24, 2022Inventors: Carlo Pinna, Sriraman Dakshinamurthy
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Patent number: 11255876Abstract: A method of measuring noise of an accelerometer can comprise exposing the accelerometer comprising a micro-electro-mechanical system (MEMS) component coupled to an application specific integrated circuit component (ASIC), to an external environmental input, with the MEMS component being configured to provide a first output to the ASIC based on the external environmental input. The method can further comprise estimating a first noise generated by operation of the MEMS component, and replacing the first output provided to the ASIC from the MEMS component, with a second output generated by a MEMS emulator component, with the second output comprising the first noise. Further, the method can include generating an output of the accelerometer based on the second output processed by the ASIC.Type: GrantFiled: March 19, 2020Date of Patent: February 22, 2022Assignee: INVENSENSE, INC.Inventors: Sriraman Dakshinamurthy, Matthew Julian Thompson, Vadim Tsinker
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Publication number: 20210262796Abstract: Microelectromechanical systems (MEMS) gyroscopes and related sense frequency tracking techniques are described. Various embodiments facilitate sense frequency tracking and offset and/or sensitivity change compensation. Exemplary embodiments can comprise receiving a sense signal at an output of a MEMS gyroscope and determining a sense resonant frequency of the sense signal. In addition, exemplary methods can comprise generating an input sine wave with a frequency of the sense resonant frequency of the sense signal injecting the input sine wave into the MEMS gyroscope, to facilitate sense frequency tracking.Type: ApplicationFiled: May 11, 2021Publication date: August 26, 2021Inventors: Sriraman Dakshinamurthy, Carlo Pinna, Ronak Chetan Desai
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Patent number: 10996075Abstract: Microelectromechanical systems (MEMS) gyroscopes and related measurement and calibration techniques are described. Various embodiments facilitate phase estimation of an ideal phase for a demodulator mixer associated with an exemplary MEMS gyroscope using quadrature tuning, which can improve offset performance over life time for exemplary MEMS gyroscopes. Exemplary embodiments can comprise adjusting a quadrature component of an exemplary MEMS gyroscope sense signal, measuring a change in offset of the exemplary MEMS gyroscope at an output of a demodulator mixer associated with the exemplary MEMS gyroscope, estimating a phase error between the quadrature component and a demodulation phase angle of the demodulator mixer based on the change in the offset, and periodically adjusting the demodulation phase angle of the demodulator mixer based on the phase error.Type: GrantFiled: December 14, 2018Date of Patent: May 4, 2021Assignee: INVENSENSE, INC.Inventors: Sriraman Dakshinamurthy, Doruk Senkal, Ali Shirvani, Ronak Chetan Desai, Carlo Pinna
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Patent number: 10948515Abstract: A device may include a sensor, a sampling unit, and an interpolator. The sensor may be configured to sense motion and output a sensed signal. The sampling unit may be configured to sample the sensed signal with a sensor clocking signal to generate a plurality of sampled values. The interpolator may be coupled to the sampling unit and may be configured to receive the plurality of sampled values, the sensor clocking signal, and a reference clocking signal external to the device. The interpolator may be configured to interpolate the plurality of sampled values based on the reference clocking signal and further based on the sensor clocking signal to generate a plurality of output values.Type: GrantFiled: December 9, 2016Date of Patent: March 16, 2021Assignee: InvenSease, Inc.Inventors: Sriraman Dakshinamurthy, Michael Perrott, Amaresh Malipatil, William Kerry Keal, Andy F. Milota
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Publication number: 20200300887Abstract: A method of measuring noise of an accelerometer can comprise exposing the accelerometer comprising a micro-electro-mechanical system (MEMS) component coupled to an application specific integrated circuit component (ASIC), to an external environmental input, with the MEMS component being configured to provide a first output to the ASIC based on the external environmental input. The method can further comprise estimating a first noise generated by operation of the MEMS component, and replacing the first output provided to the ASIC from the MEMS component, with a second output generated by a MEMS emulator component, with the second output comprising the first noise. Further, the method can include generating an output of the accelerometer based on the second output processed by the ASIC.Type: ApplicationFiled: March 19, 2020Publication date: September 24, 2020Inventors: Sriraman Dakshinamurthy, Matthew Julian Thompson, Vadim Tsinker
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Publication number: 20200264210Abstract: A MEMS accelerometer includes a suspended spring-mass system that has a frequency response to accelerations experienced over a range of frequencies. The components of the suspended spring-mass system such as the proof masses respond to acceleration in a substantially uniform manner at frequencies that fall within a designed bandwidth for the MEMS accelerometer. Digital compensation circuitry compensates for motion of the proof masses outside of the designed bandwidth, such that the functional bandwidth of the MEMS accelerometer is significantly greater than the designed bandwidth.Type: ApplicationFiled: February 19, 2020Publication date: August 20, 2020Inventors: Sriraman Dakshinamurthy, Vadim Tsinker, Matthew Julian Thompson
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Publication number: 20190186950Abstract: Microelectromechanical systems (MEMS) gyroscopes and related measurement and calibration techniques are described. Various embodiments facilitate phase estimation of an ideal phase for a demodulator mixer associated with an exemplary MEMS gyroscope using quadrature tuning, which can improve offset performance over life time for exemplary MEMS gyroscopes. Exemplary embodiments can comprise adjusting a quadrature component of an exemplary MEMS gyroscope sense signal, measuring a change in offset of the exemplary MEMS gyroscope at an output of a demodulator mixer associated with the exemplary MEMS gyroscope, estimating a phase error between the quadrature component and a demodulation phase angle of the demodulator mixer based on the change in the offset, and periodically adjusting the demodulation phase angle of the demodulator mixer based on the phase error.Type: ApplicationFiled: December 14, 2018Publication date: June 20, 2019Inventors: Sriraman Dakshinamurthy, Doruk Senkal, Ali Shirvani, Ronak Chetan Desai, Carlo Pinna
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Publication number: 20190186917Abstract: Microelectromechanical systems (MEMS) gyroscopes and related sense frequency tracking techniques are described. Various embodiments facilitate sense frequency tracking and offset and/or sensitivity change compensation. Exemplary embodiments can comprise receiving a sense signal at an output of a MEMS gyroscope and determining a sense resonant frequency of the sense signal. In addition, exemplary methods can comprise generating an input sine wave with a frequency of the sense resonant frequency of the sense signal injecting the input sine wave into the MEMS gyroscope, to facilitate sense frequency tracking.Type: ApplicationFiled: December 14, 2018Publication date: June 20, 2019Inventors: Sriraman Dakshinamurthy, Carlo Pinna, Ronak Chetan Desai
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Patent number: 10172090Abstract: A sensor headroom control circuit includes a front end analog circuit, a digital compensation circuit, and a headroom state selection circuit. The front end analog circuit has configurable headroom and is configured to receive a sensor input signal and output a sensor digital signal. The digital compensation circuit is configured to adjust the sensor digital signal to compensate for an active headroom state of the front end analog circuit and produce a compensated sensor signal. The headroom state selection circuit is configured to select the active headroom state of the front end analog circuit responsive to a detected level of the compensated sensor signal.Type: GrantFiled: October 26, 2017Date of Patent: January 1, 2019Assignee: InvenSense, Inc.Inventors: Sriraman Dakshinamurthy, Stanley Bo-Ting Wang
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Patent number: 10050613Abstract: A device includes a micro-electro-mechanical system (MEMS) sensor and a PWM modifier circuitry. The MEMS sensor may include a drive circuitry and a sense circuitry. The MEMS sensor is configured to sense motion. A carrier signal is used in the sense circuitry and the drive circuitry. The PWM modifier circuitry is configured to generate a PWM modifier signal for modifying a portion of a PWM signal and to form a modified PWM signal to compensate for changes in the carrier signal.Type: GrantFiled: November 30, 2016Date of Patent: August 14, 2018Assignee: INVENSENSE, INC.Inventor: Sriraman Dakshinamurthy
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Publication number: 20180164125Abstract: A device may include a sensor, a sampling unit, and an interpolator. The sensor may be configured to sense motion and output a sensed signal. The sampling unit may be configured to sample the sensed signal with a sensor clocking signal to generate a plurality of sampled values. The interpolator may be coupled to the sampling unit and may be configured to receive the plurality of sampled values, the sensor clocking signal, and a reference clocking signal external to the device. The interpolator may be configured to interpolate the plurality of sampled values based on the reference clocking signal and further based on the sensor clocking signal to generate a plurality of output values.Type: ApplicationFiled: December 9, 2016Publication date: June 14, 2018Inventors: Sriraman Dakshinamurthy, Michael Perrott, Amaresh Malipatil, William Kerry Keal, Andy F. Milota
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Publication number: 20180152182Abstract: A device includes a micro-electro-mechanical system (MEMS) sensor and a PWM modifier circuitry. The MEMS sensor may include a drive circuitry and a sense circuitry. The MEMS sensor is configured to sense motion. A carrier signal is used in the sense circuitry and the drive circuitry. The PWM modifier circuitry is configured to generate a PWM modifier signal for modifying a portion of a PWM signal and to form a modified PWM signal to compensate for changes in the carrier signal.Type: ApplicationFiled: November 30, 2016Publication date: May 31, 2018Inventor: Sriraman Dakshinamurthy
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Patent number: 9560595Abstract: A communication device, such as a smart phone, receives operational parameters from a network controller. The operational parameters may include, as examples, bandwidth allocation, center frequency, and receive/transmit band assignments. The operational parameters (e.g., bandwidth allocation) may change on a subframe by subframe basis. In response to the operational parameters, the communication device determines a new configuration for an envelope tracking (ET) power supply. The communication device modifies the ET power supply to implement the new configuration. The new configuration may be chosen to adapt the ET power supply to meet the demands of the operation parameters, without excess power consumption.Type: GrantFiled: June 20, 2013Date of Patent: January 31, 2017Assignee: Broadcom CorporationInventors: Sriraman Dakshinamurthy, Robert Gustav Lorenz
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Patent number: 9300332Abstract: A wireless device performs antenna tuner updates at times that minimize adverse effects on transmit and receive channels of the wireless device. The wireless device includes an antenna, an RF front end, an antenna tuner circuit and a processing module. The antenna tuner circuit is configured to substantially match a source impedance of the RF front end to a load impedance of the antenna based on a control signal. The processing module is configured to identify an update time for providing the control signal to the antenna tuner circuit that minimizes adverse effects on at least one of the transmit channel and the receive channel.Type: GrantFiled: December 23, 2013Date of Patent: March 29, 2016Assignee: BROADCOM CORPORATIONInventors: Sriraman Dakshinamurthy, Bongseok Park, Michael James Graziano, Robert Gustav Lorenz
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Patent number: 9277501Abstract: A method and telecommunication device in which the telecommunication device is provided with multiple antennas and power amplifiers to provide a beamformed transmit stage. An envelope tracking circuit helps achieve significant power savings in the power amplifier and can be used to provide the power supply for the multiple power amplifiers. A single envelope tracking power supply may be used to produce the supply voltage to the individual power amplifiers that operate on the transmit signal and its phase shifted variant. Accordingly, the user equipment experiences the benefits of both reduced power consumption using the envelope tracker and beam formed transmission.Type: GrantFiled: June 28, 2013Date of Patent: March 1, 2016Assignee: Broadcom CorporationInventors: Robert Gustav Lorenz, Sriraman Dakshinamurthy