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公开(公告)号：US20240226960A1
公开(公告)日：2024-07-11
申请号：US18615241
申请日：2024-03-25
Inventor： Axel THOMSEN , Eric J. KING , Anthony S. DOY , Thomas H. HOFF , John L. MELANSON
CPC classification number: B06B1/0223 , B06B1/0215 , B06B1/0688 , G06F3/016 , H10N30/802
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A driver circuit has first and second switching drivers for driving the transducer in a bridge-tied-load configuration, each of the switching drivers having a respective output stage for controllably switching the respective driver output node between high and low switching voltages with a controlled duty cycle. Each of switching drivers is operable in a plurality of different driver modes, wherein the switching voltages are different in said different driver modes. A controller controls the driver mode of operation and the duty cycle of the switching drivers based on the input signal. The controller is configured to control the duty cycles of the first and second switching drivers within defined minimum and maximum limits of duty cycles; and to transition between driver modes of operation when the duty cycle of one of the switching drivers reaches a duty cycle limit.
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公开(公告)号：US20220385252A1
公开(公告)日：2022-12-01
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：US20240053387A1
公开(公告)日：2024-02-15
申请号：US17884753
申请日：2022-08-10
Inventor： Arashk NOROUZPOURSHIRAZI , Stephen T. HODAPP , Ravi K. KUMMARAGUNTLA , Axel THOMSEN
IPC: G01R19/25
CPC classification number: G01R19/2506
Abstract: A system may include a passive floating attenuator configured to receive an analog physical quantity and attenuate the analog physical quantity to a floating attenuated signal defined by voltage nodes other than the voltage nodes of the analog physical quantity, an anti-aliasing filter configured to filter the floating attenuated signal to generate a filtered attenuated signal, and a switched-capacitor sampling circuit comprising a plurality of switches configured to sample the filtered attenuated signal.
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公开(公告)号：US20220368325A1
公开(公告)日：2022-11-17
申请号：US17874357
申请日：2022-07-27
Inventor： Axel THOMSEN , Eric J. KING , Thomas H. HOFF , John L. MELANSON , Angus BLACK , Ross C. MORGAN , Malcolm BLYTH
IPC: H03K17/687 , H02N2/00 , H02M3/158
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A switching driver has first and second supply node for receiving supply voltages and includes an output bridge stage, a capacitor and a network of switches. The network of switches is operable in different switch states to provide different switching voltages to the output bridge stage. A controller is configured to control the switch state of the network of switches and a duty cycle of output switches of the output bridge stage based on an input signal to generate an output signal for driving the transducer.
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公开(公告)号：US20220263519A1
公开(公告)日：2022-08-18
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 comprising 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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Patent Agency Ranking
公开(公告)号：US20220255515A1
公开(公告)日：2022-08-11
申请号：US17173813
申请日：2021-02-11
Inventor： Ravi K. KUMMARAGUNTLA , Christophe J. AMADI , John L. MELANSON , Axel THOMSEN , John C. TUCKER , Eric J. KING
IPC: H03F3/387 , G01R31/40 , G01R31/3842
Abstract: A signal processing system may include a signal path and a chop management circuit. The signal path may comprise a chopper configured to chop a differential input signal to the signal path at a chopping frequency and a low-pass filter downstream of the chopper and configured to filter out intermodulation products of a direct current offset of the signal path and intermodulation products of an aggressor on the differential input signal in order to generate an output signal. The chop management circuit may be communicatively coupled to the chopper and configured to, based on operational parameters associated with the signal path, dynamically manage energy of one or more clock signals used to define the chopping frequency.
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公开(公告)号：US20220158635A1
公开(公告)日：2022-05-19
申请号：US17590943
申请日：2022-02-02
Inventor： Axel THOMSEN , Eric J. KING , Anthony S. DOY , Thomas H. HOFF , John L. MELANSON
IPC: H03K17/687 , H02N2/00 , H02M3/158
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A switching driver has first and second supply node for receiving supply voltages and includes an output bridge stage, a capacitor and a network of switches. The network of switches is operable in different switch states to provide different switching voltages to the output bridge stage. A controller is configured to control the switch state of the network of switches and a duty cycle of output switches of the output bridge stage based on an input signal to generate an output signal for driving the transducer.
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公开(公告)号：US20180352339A1
公开(公告)日：2018-12-06
申请号：US15987346
申请日：2018-05-23
Inventor： Marek Sebastian PIECHOCINSKI , Richard Ian LAMING , Tsjerk Hans HOEKSTRA , Colin Robert JENKINS , Axel THOMSEN
Abstract: The application describes MEMS transducers having a patterned membrane electrode which incorporates a plurality of openings or voids. A conductive element is provided on the surface of the underlying membrane within the opening.
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公开(公告)号：US20230381814A1
公开(公告)日：2023-11-30
申请号：US18323779
申请日：2023-05-25
Inventor： Axel THOMSEN , Eric J. KING , Anthony S. DOY , Thomas H. HOFF , John L. MELANSON
CPC classification number: B06B1/0223 , G06F3/016 , B06B1/0215 , B06B1/0688 , H10N30/802
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A driver circuit has first and second switching drivers for driving the transducer in a bridge-tied-load configuration, each of the switching drivers having a respective output stage for controllably switching the respective driver output node between high and low switching voltages with a controlled duty cycle. Each of switching drivers is operable in a plurality of different driver modes, wherein the switching voltages are different in said different driver modes. A controller controls the driver mode of operation and the duty cycle of the switching drivers based on the input signal. The controller is configured to control the duty cycles of the first and second switching drivers within defined minimum and maximum limits of duty cycles; and to transition between driver modes of operation when the duty cycle of one of the switching drivers reaches a duty cycle limit.
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公开(公告)号：US20200045485A1
公开(公告)日：2020-02-06
申请号：US16598799
申请日：2019-10-10
Inventor： Jean Pierre LASSEUGUETTE , Aleksey Sergeyevich KHENKIN , Axel THOMSEN
Abstract: The disclosure provides a system, comprising: a MEMS capacitive transducer, comprising one or more first capacitive plates coupled to a first node and one or more second capacitive plates coupled to a second node; biasing circuitry coupled to the first node, operable to provide a biasing voltage to the one or more first capacitive plates; and test circuitry coupled to the second node, operable to: selectively apply one or more current sources to the second node, so as to charge and discharge the MEMS capacitive transducer and so vary a signal based on a voltage at said second node between an upper value and a lower value; determine a parameter that is indicative of a time period of the variation of the signal; and determine a capacitance of the MEMS capacitive transducer based on the parameter that is indicative of the time period.
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