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公开(公告)号：US11522528B2
公开(公告)日：2022-12-06
申请号：US17086728
申请日：2020-11-02
Inventor： Gary Robertson , Hamed Sadati , Rupesh Khare , Sameer Baveja
Abstract: This application relates to methods and apparatus for voltage control, and in particular to maintain safe voltages for components of audio driving circuits that are operable in a high voltage mode. An audio driving circuit (100) may include a power supply module (106) and may be operable such that, in use, a voltage magnitude at a source terminal of at least a first transistor (306, 309, 603, 605) of the audio driving circuit can exceed its gate-source voltage tolerance. A voltage generator (111 P) is configured to output a first intermediate voltage (VSAFEP) to an intermediate voltage path for use as a gate control voltage for at least the first transistor, to maintain its gate-source voltage below tolerance. An intermediate path voltage clamp (114P) is provided for selectively clamping the intermediate voltage path to a voltage level, so as to maintain the magnitude of the gate-source voltage of the first transistor below tolerance. The voltage clamp (114P) is enabled by a reset condition (RST) for the audio driving circuit.
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公开(公告)号：US11668738B2
公开(公告)日：2023-06-06
申请号：US17354237
申请日：2021-06-22
Inventor： Mehul Mistry , Rupesh Khare , Jack Fuller
CPC classification number: G01R27/2605 , G01R31/2825 , H04R29/001
Abstract: Circuitry for detecting a capacitive load coupled between a first node and a second node, the circuitry comprising: drive circuitry for applying a first voltage to a first node over a first time period; processing circuitry configured to: measure a second voltage at the first node; and determine that the load is a capacitive load based on the second voltage.
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Patent Agency Ranking
公开(公告)号：US10142721B2
公开(公告)日：2018-11-27
申请号：US15439323
申请日：2017-02-22
Inventor： Rupesh Khare
Abstract: This application describes methods and apparatus for selectively clamping a signal path (106) for an analog audio signal to a clamp voltage, e.g. ground. Voltage clamping circuitry (200) is disclosed having a first switching device (201) in series with a second switching device (202) between a node of the signal path and the clamp voltage. The clamping circuitry is configured to be operable in: a first state where the first and second switching devices are both on to electrically connect the signal path to the clamp voltage; and also a second state to electrically disconnect the signal path from the clamp voltage. In the second state one of the first and second switching devices is configured to block conduction when the voltage at said node of the signal path is positive and the other switching device is configured to block conduction when the voltage at said node of the signal path is negative.
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公开(公告)号：US20250132730A1
公开(公告)日：2025-04-24
申请号：US18491252
申请日：2023-10-20
Inventor： Payel Mukherjee , Rupesh Khare , Ambreesh Bhattad
Abstract: An amplifier circuit and its method of operation reduce leakage in the output stage of the under no-load or low-load conditions. The amplifier circuit includes an amplifier stage that generates an output signal, an output stage including an output device, a pre-driver device coupled to a gate of the output device, and a feedback connection from the output device to the amplifier stage. A power supply rail of the amplifier is provided by a first power supply voltage, and the output signal of the amplifier stage is coupled to an input of the pre-driver device. A power supply rail of the output stage is provided by a second power supply voltage having a magnitude less than the first power supply voltage. An increased voltage magnitude at the output stage is compensated by driving a channel field potential of the output device above the second power supply voltage.
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公开(公告)号：US20250132729A1
公开(公告)日：2025-04-24
申请号：US18492853
申请日：2023-10-24
Inventor： Rupesh Khare , Ambreesh Bhattad , Jithender Tirunahari
Abstract: An amplifier circuit employing an output stage current mirror has improved power efficiency and stability. The amplifier circuit includes one or more amplifier stages connected in cascade. The one or more amplifier stages receive an analog input signal and generate a drive signal. The current mirror output stage includes an output device and a diode-connected mirror device. A gate of the output device is coupled to a gate of the mirror device, and the mirror device is coupled to an output of the one or more amplifier stages to receive the drive signal. The current mirror output stage provides an adjustable ratio by activation of one more additional devices that are selectively coupled to a mirror arm and an output arm of the current mirror output stage, decreasing the pre-driver power dissipation for high current levels, and decreasing the output capacitance at lower current levels, improving stability.
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公开(公告)号：US10856073B2
公开(公告)日：2020-12-01
申请号：US16708854
申请日：2019-12-10
Inventor： Rupesh Khare , Simon Foster
Abstract: This application relates to switch arrangements, in particular switch arrangements suitable for switchable connecting nodes of audio driving circuitry (100) that may, in use, experience a signal swing depending on an output audio driving signal (VD). A switch arrangement (300) comprises first and second transistors (301 and 302) of the same polarity type connected in series between the first and second nodes, with a third transistor (303) connected between a defined voltage (VS) and an intermediate node (N3) between the first and second transistors. The first transistor (301) has a drain connection to the first node (N1) and a source connection to the intermediate node (N3). The second transistor (302) has a drain connection to the second node (N2) and a source connection to the intermediate node (N3). The third transistor (303) has a source connection to the defined voltage (VS) and a drain connection to the intermediate node (N3) and regulates the voltage at the intermediate node when the switch arrangement is in an off state.
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公开(公告)号：US10855258B1
公开(公告)日：2020-12-01
申请号：US16594794
申请日：2019-10-07
Inventor： Gary Robertson , Hamed Sadati , Rupesh Khare , Sameer Baveja
Abstract: This application relates to methods and apparatus for voltage control, and in particular to maintain safe voltages for components of audio driving circuits that are operable in a high voltage mode. An audio driving circuit (100) may include a power supply module (106) and may be operable such that, in use, a voltage magnitude at a source terminal of at least a first transistor (306, 309, 603, 605) of the audio driving circuit can exceed its gate-source voltage tolerance. A voltage generator (111P) is configured to output a first intermediate voltage (VSAFEP) to an intermediate voltage path for use as a gate control voltage for at least the first transistor, to maintain its gate-source voltage below tolerance. An intermediate path voltage clamp (114P) is provided for selectively clamping the intermediate voltage path to a voltage level, so as to maintain the magnitude of the gate-source voltage of the first transistor below tolerance. The voltage clamp (114P) is enabled by a reset condition (RST) for the audio driving circuit.
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