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公开(公告)号：US20210297072A1
公开(公告)日：2021-09-23
申请号：US16820897
申请日：2020-03-17
Inventor： Ramin ZANBAGHI , Cory J. PETERSON
IPC: H03K17/081 , H03K7/08
Abstract: A system may include an output driving stage comprising a first switch configured to selectively open and close an electrical path between a first supply voltage and an output terminal of the output driving stage and a second switch configured to selectively open and close an electrical path between a second supply voltage and the output terminal of the output driving stage, wherein the second supply voltage is lower than the first supply voltage. The system may also include detection and protection circuitry configured to monitor a physical quantity indicative of the second supply voltage and responsive to the physical quantity exceeding an overvoltage threshold, electrically isolate the output terminal from the second supply voltage.
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公开(公告)号：US20230122394A1
公开(公告)日：2023-04-20
申请号：US17502689
申请日：2021-10-15
Inventor： Ramin ZANBAGHI , Lingli ZHANG , Wei XU , Justin RICHARDSON , John L. MELANSON
Abstract: A system for sensing an electrical quantity may include a sensing stage configured to sense the electrical quantity and generate a sense signal indicative of the electrical quantity, wherein the electrical quantity is indicative of an electrical signal generated by a Class-DG amplifier configured to drive a load wherein the Class-DG amplifier has multiple signal-level common modes and a common-mode compensator configured to compensate for changes to a common-mode voltage of a differential supply voltage of the driver occurring when switching between signal-level common modes of the Class-DG amplifier.
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3.发明申请公开(公告)号：US20210351751A1
公开(公告)日：2021-11-11
申请号：US16869226
申请日：2020-05-07
Inventor： Ramin ZANBAGHI , Cory J. PETERSON , Eric KIMBALL
Abstract: A system may include a Class-D stage comprising a first high-side switch coupled between a supply voltage and a first output terminal of the Class-D stage, a second high-side switch coupled between the supply voltage and a second output terminal of the Class-D stage, a first low-side switch coupled between a ground voltage and the first output terminal, and a second low-side switch coupled between the ground voltage and the second output terminal. The system may also include current sensing circuitry comprising a sense resistor, such that an output current through a load coupled between the first output terminal and the second output terminal causes a first sense voltage proportional to the output current across the sense resistor. The system may additionally include a modulator for generating a differential pulse-width modulation driving signal to the first high-side switch, the second high-side switch, the first low-side switch, and the second low-side switch and pilot tone injection circuitry configured to inject a periodic pilot tone into the differential pulse-width modulation driving signal at a pilot tone frequency.
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4.发明公开公开(公告)号：US20240106448A1
公开(公告)日：2024-03-28
申请号：US17952863
申请日：2022-09-26
Inventor： Arashk NOROUZPOURSHIRAZI , Ramin ZANBAGHI , Stephen T. HODAPP , Christophe J. AMADI , Ravi K. KUMMARAGUNTLA , Dhrubajyoti DUTTA
IPC: H03M1/06
CPC classification number: H03M1/0617
Abstract: A system may include a sampling capacitor and a switch network. The switch network may include one or more first sampling switches electrically coupled to the sampling capacitor and configured to be activated during a first phase of a sampling cycle of the system and one or more second sampling switches electrically coupled to the sampling capacitor and configured to be activated during a second phase of the sampling cycle, wherein the switch network is configured to reset the sampling capacitor to a data-independent and/or signal-independent charge during a reset phase of the sampling cycle.
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公开(公告)号：US20190058484A1
公开(公告)日：2019-02-21
申请号：US16168067
申请日：2018-10-23
Inventor： Ramin ZANBAGHI , Daniel J. ALLEN , John L. MELANSON , Aniruddha SATOSKAR , Akshay GODBOLE
CPC classification number: H03M1/188 , H03G3/3052 , H03H19/004 , H03M1/00 , H03M1/12 , H03M1/121 , H03M1/186 , H03M1/804 , H03M3/468 , H03M3/492 , H04L25/061 , H04R3/04
Abstract: A system may comprise a high-pass filter having an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a switched-capacitor resistor coupled between the output and a reference voltage, and control circuitry configured to control the reference voltage to cancel current leakage into a circuit coupled to the output. The input, the output, the capacitor, and the switched-capacitor resistor may be arranged to generate the output signal as a high-pass filtered version of the input signal and the high-pass filter may be configured to operate in a plurality of modes comprising at least a high-impedance mode and a low-impedance mode in which the resistance of the switched-capacitor resistor is significantly smaller than the resistance when in the high-impedance mode.A system may include a plurality of processing paths having a first path configured to generate a first digital signal based on an analog input signal and a second path configured to generate a second digital signal based on the analog input signal, the second path having a high-pass filter for filtering the analog input signal prior to the analog input signal being processed by the remainder of the second path, and the high-pass filter having a corner frequency. Control circuitry may be configured to determine frequency-dependent weighted proportions of the first and second digital signals to be combined into an output digital signal based on a characteristic of the analog input signal. Frequency-dependent weighted proportions may be such that the digital output signal includes spectral content of the first digital signal below the corner frequency to account for spectral content of the second digital signal below the corner frequency being filtered.A system may include an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a variable resistor coupled to the output and having a plurality of modes including a first mode in which the variable resistor has a first resistance and a second mode in which the variable resistor has a second resistance, and control circuitry configured to determine a difference between the input signal and the output signal and switch between modes of the plurality of modes when the difference is less than a predetermined threshold.
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Patent Agency Ranking
公开(公告)号：US20230178279A1
公开(公告)日：2023-06-08
申请号：US17540648
申请日：2021-12-02
Inventor： Chandra B. PRAKASH , Ramin ZANBAGHI
Abstract: A system may include an electromagnetic load, a driver configured to drive the electromagnetic load with a driving signal, and a processing system communicatively coupled to the electromagnetic load and configured to, during a haptic mode of the system couple a first terminal of the electromagnetic load to a ground voltage and cause the driving signal to have a first slew rate, and during a load sensing mode of the system for sensing a current associated with the electromagnetic load, couple the first terminal to a current-sensing circuit having a sense resistor coupled between the first terminal and an electrical node driven to a common-mode voltage and cause the driving signal to have a second slew rate lower than the first slew rate.
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7.发明申请公开(公告)号：US20220158597A1
公开(公告)日：2022-05-19
申请号：US17667234
申请日：2022-02-08
Inventor： Ramin ZANBAGHI , Cory J. PETERSON , Eric KIMBALL
Abstract: A system may include a Class-D stage comprising a first high-side switch coupled between a supply voltage and a first output terminal of the Class-D stage, a second high-side switch coupled between the supply voltage and a second output terminal of the Class-D stage, a first low-side switch coupled between a ground voltage and the first output terminal, and a second low-side switch coupled between the ground voltage and the second output terminal. The system may also include current sensing circuitry comprising a sense resistor, such that an output current through a load coupled between the first output terminal and the second output terminal causes a first sense voltage proportional to the output current across the sense resistor. The system may additionally include a modulator for generating a differential pulse-width modulation driving signal to the first high-side switch, the second high-side switch, the first low-side switch, and the second low-side switch and pilot tone injection circuitry configured to inject a periodic pilot tone into the differential pulse-width modulation driving signal at a pilot tone frequency.
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公开(公告)号：US20210211099A1
公开(公告)日：2021-07-08
申请号：US16732993
申请日：2020-01-02
Inventor： Eric KIMBALL , Chandra PRAKASH , Ramin ZANBAGHI , Cory J. PETERSON
Abstract: A system may include a forward signal path having a forward gain and configured to receive an input signal at an input and generate an output signal at an output as a function of the input signal, a feedback signal path having a feedback gain and coupled between the output and the input, and a control subsystem configured to operate the forward signal path and the feedback signal path in at least two modes comprising a first mode in which the forward gain is a first forward gain and the feedback gain is a first feedback gain and a second mode in which the forward gain is a second forward gain smaller than the first forward gain and the feedback gain is a second feedback gain larger than the first feedback gain. The control subsystem may cause operation in the first mode when signal content is present in the input signal and may cause operation in the second mode when signal content is absent from the input signal.
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公开(公告)号：US20210344310A1
公开(公告)日：2021-11-04
申请号：US17003564
申请日：2020-08-26
Inventor： Ramin ZANBAGHI , Cory J. PETERSON , Anand ILANGO , Eric KIMBALL
IPC: H03F3/217 , H03F3/45 , G05F1/46 , H03F1/38 , G01R1/20 , G01R19/175 , G01R19/165 , H04R1/10
Abstract: A system may include a Class-D stage comprising a first high-side switch coupled between a supply voltage and a first output terminal of the Class-D stage, a second high-side switch coupled between the supply voltage and a second output terminal of the Class-D stage, a first low-side switch coupled between a ground voltage and the first output terminal, and a second low-side switch coupled between the ground voltage and the second output terminal. The system may also include current sensing circuitry comprising a first sense resistor coupled between the first high-side switch and the supply voltage, such that an output current through a load coupled between the first output terminal and the second output terminal causes a first sense voltage proportional to the output current across the first sense resistor when the first high-side switch is activated. The current sensing circuitry may also include a second sense resistor coupled between the second high-side switch and the supply voltage, such that an output current through the load causes a second sense voltage proportional to the output current across the second sense resistor when the second high-side switch is activated. The system may also include measurement circuitry configured to measure the first sense voltage and the second sense voltage to determine the output current.
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公开(公告)号：US20210344309A1
公开(公告)日：2021-11-04
申请号：US16864893
申请日：2020-05-01
Inventor： Ramin ZANBAGHI , Cory J. PETERSON , Anand ILANGO , Eric KIMBALL
IPC: H03F3/217
Abstract: A system may include a Class-D stage comprising a first high-side switch coupled between a supply voltage and a first output terminal of the Class-D stage, a second high-side switch coupled between the supply voltage and a second output terminal of the Class-D stage, a first low-side switch coupled between a ground voltage and the first output terminal, and a second low-side switch coupled between the ground voltage and the second output terminal. The system may also include current sensing circuitry comprising a first sense resistor coupled between the first low-side switch and the ground voltage, such that an output current through a load coupled between the first output terminal and the second output terminal causes a first sense voltage proportional to the output current across the first sense resistor when the first low-side switch is activated. The current sensing circuitry may also include a second sense resistor coupled between the second low-side switch and the ground voltage, such that an output current through the load causes a second sense voltage proportional to the output current across the second sense resistor when the second low-side switch is activated. The system may also include measurement circuitry configured to measure the first sense voltage and the second sense voltage to determine the output current.
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