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公开(公告)号：US10009686B1
公开(公告)日：2018-06-26
申请号：US15488931
申请日：2017-04-17
Inventor： Tejasvi Das , Xin Zhao , John L. Melanson
CPC classification number: H04R1/1041 , H03M1/002 , H03M1/742 , H04R1/1016 , H04R3/00 , H04R2460/03
Abstract: A playback path may include an input configured to receive an input signal, an output configured to drive a differential output signal, a differential current-mode digital-to-analog converter configured to convert the input signal into the differential output signal, and a control circuit. The differential current-mode digital-to-analog converter may include a plurality of current-mode digital-to-analog elements configured to be selectively enabled and disabled based on the input signal and at least one reference element in a current mirror relationship with the plurality of current-mode digital-to-analog elements such that each individual current through each current-mode digital-to-analog element is a scaled version of a reference current of the at least one reference element. The control circuit may be configured to scale current mirror ratios between the at least one reference element and the plurality of current-mode digital-to-analog elements based on a characteristic of the input signal.
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公开(公告)号：US20180152174A1
公开(公告)日：2018-05-31
申请号：US15365451
申请日：2016-11-30
Inventor： Ramin Zanbaghi , Tejasvi Das , John L. Melanson , Axel Thomsen
Abstract: A variable resistor may be coupled between a reference voltage source and components of an integrated circuit to reduce issues relating to thermal noise from a reference voltage signal generated by the reference voltage source. The variable resistor may be set to a low level during a first time period and a high level during a second time period, in which the time periods correspond to a sampling period of a switched-capacitor circuit. The low resistance time period may allow quick settling of an input reference voltage signal, whereas the high resistance time period may reduce a bandwidth of noise on a sampling capacitor coupled to the reference voltage signal. The variable resistor and switched-capacitor network may be used in an analog-to-digital converter (ADC), such as in audio circuits.
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公开(公告)号：US20180062583A1
公开(公告)日：2018-03-01
申请号：US15418405
申请日：2017-01-27
Inventor： Xin Zhao , Tejasvi Das , Hossein Mirzaie , Lei Zhu , Xiaofan Fei
CPC classification number: H03F1/26 , H03F3/187 , H03F3/2173 , H03F3/45475 , H03F3/45928 , H03F2200/03 , H03F2203/45138 , H03F2203/45438 , H03F2203/45512
Abstract: A dynamic common reference input (CMRI) signal may be provided to an operational amplifier, or “op-amp,” in an amplifier system to reduce the common mode ripple of the fully-differential op-amp, while adding little or no noise in the amplifier system. The dynamic CMRI signal may be controlled such that a common-mode component of two amplifier input nodes of the operational amplifier is made approximately independent of two input signals received at two system input nodes of the amplifier system. An amplifier system with the dynamic CMRI may be used in class-D amplifiers, such as amplifiers for audio systems that generate output for headphones or speakers.
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公开(公告)号：US09692444B1
公开(公告)日：2017-06-27
申请号：US15198982
申请日：2016-06-30
Inventor： Tejasvi Das , John L. Melanson , Ramin Zanbaghi
IPC: H03M3/00
CPC classification number: H03M3/322 , G11C27/026 , H03M1/0863 , H03M3/342 , H03M3/376 , H03M3/424 , H03M3/464 , H03M3/50
Abstract: In accordance with embodiments of the present disclosure, a method of neutralizing voltage kickback associated with a reference buffer of a switched capacitor based data converter having a first switched capacitor coupled to an output node of the reference buffer wherein the first switched capacitor comprises at least one first capacitor and at least one first switch may be provided. The method may include coupling a passive network to the output node of the reference buffer in response to a presence of a condition for encountering the voltage kickback in order to create an approximately equal and opposite voltage kickforward by the passive network to at least partially neutralize the voltage kickback.
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公开(公告)号：US11948739B2
公开(公告)日：2024-04-02
申请号：US17568248
申请日：2022-01-04
Inventor： Emmanuel A. Marchais , Tejasvi Das , Siddharth Maru
IPC: H01F7/18
CPC classification number: H01F7/1844 , H01F2007/185
Abstract: A system may include an electromagnetic actuator, a first coil configured to drive mechanical displacement of the electromagnetic actuator, a second coil configured to drive mechanical displacement of the electromagnetic actuator, and an inductance sensing subsystem having an inductance sensing path coupled to the first coil and the second coil. The inductance sensing subsystem may be configured to select one of the first coil and the second coil for driving mechanical displacement of the electromagnetic actuator, select the other of the first coil and the second coil as a sensing coil for sensing displacement of the electromagnetic actuator, determine a displacement of the electromagnetic actuator based on a measurement of estimated inductance of the sensing coil, and when switching selection of the sensing coil from the first coil to the second coil determine the displacement of the first coil based on a measured inductance of the first coil at approximately the time of switching selection, estimate state variables of the inductance sensing path to be used with the second coil based on the displacement, and apply the state variables to the inductance sensing path after switching selection of the sensing coil from the first coil to the second coil.
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Patent Agency Ranking
公开(公告)号：US11836290B2
公开(公告)日：2023-12-05
申请号：US17157304
申请日：2021-01-25
Inventor： Michael A. Kost , Bruce E. Duewer , Tejasvi Das , Matthew Beardsworth , Anthony S. Doy
Abstract: A system may include at least one resistive-inductive-capacitive sensor and a control circuit configured to maintain timing parameters for operation of the at least one resistive-inductive-capacitive sensor and vary at least one of the timing parameters to control a spectrum associated with the at least one resistive-inductive-capacitive sensor, wherein the spectrum comprises one of a sensor activity spectrum of the at least one resistive-inductive-capacitive sensor and a current usage spectrum associated with electrical current delivered to the at least one resistive-inductive-capacitive sensor from a source of electrical energy.
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公开(公告)号：US11821761B2
公开(公告)日：2023-11-21
申请号：US17215157
申请日：2021-03-29
Inventor： Tejasvi Das , Siddharth Maru , John L. Melanson
IPC: G01D5/20
CPC classification number: G01D5/202
Abstract: A system may include a resistive-inductive-capacitive sensor configured to sense a physical quantity, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure one or more resonance parameters associated with the resistive-inductive-capacitive sensor and indicative of the physical quantity and, in order to maximize dynamic range in determining the physical quantity from the one or more resonance parameters, dynamically modify, across the dynamic range, either of reliance on the one or more resonance parameters in determining the physical quantity or one or more resonance properties of the resistive-inductive-capacitive sensor.
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公开(公告)号：US11595037B2
公开(公告)日：2023-02-28
申请号：US17848051
申请日：2022-06-23
Inventor： Matthew Beardsworth , Tejasvi Das , Siddharth Maru , Luke Lapointe
IPC: H03K17/97 , H03K17/14 , H03K17/975
Abstract: A system may include a sensor configured to output a sensor signal indicative of a distance between the sensor and a mechanical member associated with the sensor, a measurement circuit communicatively coupled to the sensor and configured to determine a physical force interaction with the mechanical member based on the sensor signal, and a compensator configured to monitor the sensor signal and to apply a compensation factor to the sensor signal to compensate for changes to properties of the sensor based on at least one of changes in a distance between the sensor and the mechanical member and changes in a temperature associated with the sensor.
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公开(公告)号：US11520436B2
公开(公告)日：2022-12-06
申请号：US17097384
申请日：2020-11-13
Inventor： Josh Sanz-Robinson , Siddharth Maru , Tejasvi Das
Abstract: A correction unit for use in a sensor system, the sensor system comprising a force sensor configured to output a sensor signal indicative of a temporary mechanical distortion of a material under an applied force, the correction unit configured, based on the sensor signal, to: estimate an effect of the applied force on how the material will return towards an undistorted form upon a substantial reduction or removal of the applied force; and generate a corrected signal based on the estimation.
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公开(公告)号：US11507267B2
公开(公告)日：2022-11-22
申请号：US17471529
申请日：2021-09-10
Inventor： Hamid Sepehr , Pablo Peso Parada , Willem Zwart , Tom Birchall , Michael Allen Kost , Tejasvi Das , Siddharth Maru , Matthew Beardsworth , Bruce E. Duewer
Abstract: A force sensing system for determining if a user input has occurred, the system comprising: an input channel, to receive an input from at least one force sensor; an activity detection stage, to monitor an activity level of the input from the at least one force sensor and, responsive to an activity level which may be indicative of a user input being reached, to generate an indication that an activity has occurred at the force sensor; and an event detection stage to receive said indication, and to determine if a user input has occurred based on the received input from the at least one force sensor.
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