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公开(公告)号：US10531213B2
公开(公告)日：2020-01-07
申请号：US15939836
申请日：2018-03-29
Inventor： Paul Wilson
Abstract: The present disclosure relates to a system comprising: a MEMS capacitive transducer comprising a first electrode and a second electrode; integrator circuitry; and test circuitry. The MEMS capacitive transducer forms part of a negative feedback path of the integrator circuitry, and the test circuitry is operable to selectively apply one or more current sources to an input of the integrator circuitry based on a signal at an output of the integrator so as to generate a periodic signal at the output of the integrator circuitry. A frequency of the periodic signal is at least partially dependent upon a capacitance of the MEMS capacitive transducer. The system is further operative to determine a parameter indicative of the frequency of the periodic signal and to estimate the capacitance of the MEMS capacitive transducer based on the parameter indicative of the frequency of the periodic signal.
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公开(公告)号：US12047097B2
公开(公告)日：2024-07-23
申请号：US17885126
申请日：2022-08-10
Inventor： Arashk Norouzpourshirazi , Stephen T. Hodapp , Ravi K. Kummaraguntla , Paul Wilson , Axel Thomsen
CPC classification number: H03M3/496 , G11C27/024 , H02M3/07 , H03K17/063 , H03M1/1245 , H02M3/076
Abstract: A system may include a switched-capacitor analog front end comprising a plurality of switches for sampling an analog physical quantity and a bootstrap generation network electrically coupled to the plurality of switches and configured to generate a bootstrap sampling clock for controlling the plurality of switches and generate a floating supply voltage for the bootstrap sampling clock based on the analog physical quantity.
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公开(公告)号：US10481121B2
公开(公告)日：2019-11-19
申请号：US15904737
申请日：2018-02-26
Inventor： Paul Wilson , Karthikeya Kodur
Abstract: This application relates to methods and apparatus for operating MEMS sensors, in particular MEMS capacitive sensors (CMEMS) such as a microphones. An amplifier apparatus (300) is arranged to amplify an input signal (VINP) received at a sense node (104) from the MEMS capacitive sensor. An antiphase signal generator (201; 304) generates a second signal (VINN) which is in antiphase with the input signal (VINP) and an amplifier arrangement (105; 305) is configured to receive the input signal (VINP) at a first input and the second signal (VINN) at a second input and to output corresponding amplified first and second output signals. This converts a single ended input signal effectively into a differential input signal.
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Patent Agency Ranking
公开(公告)号：US12283928B2
公开(公告)日：2025-04-22
申请号：US17586111
申请日：2022-01-27
Inventor： Sven Soell , Paul Wilson , James T. Deas , Axel Thomsen
Abstract: A circuit may include a two-stage feedforward compensated operational transconductance integrated amplifier, and the two-stage feedforward compensated operational transconductance integrated amplifier may include an input terminal, an output terminal, a signal path between the input terminal and the output terminal, the signal path comprising a first signal path gain stage and a second signal path gain stage, and ripple rejection circuitry coupled between the input terminal and an intermediate node of the signal path located between the first signal path gain stage and the second signal path gain stage. The ripple rejection circuitry may include a first ripple rejection circuitry gain stage coupled at its input to the input terminal and coupled at its output to an input terminal of a chopper circuit, a notch filter coupled at its input to an output terminal of the chopper circuit, and a second ripple rejection circuitry gain stage coupled at its input to an output terminal of the notch filter and coupled at its output to the intermediate node.
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公开(公告)号：US11777516B2
公开(公告)日：2023-10-03
申请号：US17667953
申请日：2022-02-09
Inventor： John L. Melanson , Axel Thomsen , Mucahit Kozak , Paul Wilson , Eric J. King
IPC: H03M3/00
Abstract: A signal processing system may include a sensor readout channel configured to convert an electronic signal into a digital quantity. The sensor readout channel may include a first-order sigma-delta modulator having a modulator input and a modulator output, first outside chopping switches located at the modulator input, second outside chopping switches located at the modulator output, an auxiliary path having an analog-to-digital converter (ADC) having an auxiliary path input and an auxiliary path output, the auxiliary path input configured to receive as its input signal a signal output by a memory element of the first-order sigma-delta modulator, and a signal combiner configured to combine a modulator output signal generated by the first-order sigma-delta modulator with an auxiliary path output signal generated by the auxiliary path to generate a combined output signal.
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公开(公告)号：US11621683B2
公开(公告)日：2023-04-04
申请号：US17162229
申请日：2021-01-29
Inventor： Wei Xu , Ravi Kummaraguntla , Paul Wilson , Mujo Kozak , Christian Larsen , John L. Melanson , Yongjie Cheng
IPC: H03F3/45
Abstract: A system may include a front end differential amplifier having two input terminals, two input resistors, each of the two input resistors coupled to a respective one of the two input terminals, and an input common mode biasing circuit for an output stage of the front end differential amplifier, the input common mode biasing circuit comprising two current sources configured to generate currents for biasing the output stage of the front end differential amplifier.
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公开(公告)号：US12101097B2
公开(公告)日：2024-09-24
申请号：US17987448
申请日：2022-11-15
Inventor： Paul Wilson , James T. Deas , Mucahit Kozak , Graeme G. Mackay
CPC classification number: H03M1/1023 , H03M1/0609
Abstract: Coulomb counter circuitry operable in a first mode of operation and a second mode of operation, the coulomb counter circuitry comprising: first analog to digital converter (ADC) circuitry configured to generate a first ADC output signal indicative of a current through a load coupled to the coulomb counter circuitry; second analog to digital converter (ADC) circuitry; offset correction circuitry; and accumulator circuitry configured to generate a signal indicative of a cumulative amount of charge transferred to the load, wherein in the second mode of operation, the coulomb counter circuitry is operable to enable the second ADC circuitry and to generate an offset correction factor based at least in part on a second ADC output signal output by the second ADC circuitry, and wherein in subsequent operation of the coulomb counter circuitry in the first mode of operation, the offset correction circuitry applies the offset correction factor to the first ADC output signal.
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公开(公告)号：US10712304B2
公开(公告)日：2020-07-14
申请号：US16567727
申请日：2019-09-11
Inventor： Paul Wilson , Karthikeya Kodur
Abstract: This application relates to methods and apparatus for operating MEMS sensors, in particular MEMS capacitive sensors (CMEMS) such as a microphones. An amplifier apparatus is arranged to amplify an input signal (VINP) received at a sense node from the MEMS capacitive sensor. An antiphase signal generator generates a second signal (VINN) which is in antiphase with the input signal (VINP) and an amplifier arrangement is configured to receive the input signal (VINP) at a first input and the second signal (VINN) at a second input and to output corresponding amplified first and second output signals. This converts a single ended input signal effectively into a differential input signal.
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