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公开(公告)号：US10812074B2
公开(公告)日：2020-10-20
申请号：US16582528
申请日：2019-09-25
Inventor： Yongjie Cheng , Lei Zhu , Kyehyung Lee
Abstract: In accordance with embodiments of the present disclosure, a system may include a buffer and a switch coupled between the buffer and a voltage supply such that the switch controls a varying voltage at a varying voltage node coupled to the buffer.
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公开(公告)号：US12160166B2
公开(公告)日：2024-12-03
申请号：US17971039
申请日：2022-10-21
Inventor： Lingli Zhang , Yongjie Cheng , John L. Melanson
Abstract: A driver apparatus for driving a load with a differential drive signal is described. For a level of input signal within a first range, a first switching driver modulates the voltage at a first output node with a first modulation index by switchably connecting at least one flying capacitor to the first output node, whilst a second switching driver modulates the voltage at a second output node with a second modulation index by controlling switching between DC voltages that are maintained throughout a switching cycle of the driver apparatus. The first and second switching drivers are controlled so, for at least a first part of the first input range, a change in input signal level results in a change of the first controlled modulation index that has a different magnitude to any change in the second controlled modulation index, a constant modulation frequency of the differential drive signal is maintained.
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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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Patent Agency Ranking
公开(公告)号：US10581322B2
公开(公告)日：2020-03-03
申请号：US15783506
申请日：2017-10-13
Inventor： Eric J. King , Aaron J. Brennan , Christian Larsen , John L. Melanson , Yongjie Cheng , Adrian Colli-Menchi
Abstract: A system may include a charge pump configured to operate in a plurality of modes including a first mode in which the ratio of an output voltage to an input voltage of the charge pump is a first ratio and a second mode in which the ratio is a second ratio and a controller configured to limit current flowing between a power source of the charge pump to the charge pump, wherein the power source provides the input voltage, by limiting a transfer of charge between the power source and the charge pump during a switching cycle of the charge pump responsive to a change in operation between modes of the plurality of modes.
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公开(公告)号：US10164590B2
公开(公告)日：2018-12-25
申请号：US15910774
申请日：2018-03-02
Inventor： Lingli Zhang , Yongjie Cheng , Lei Zhu , Christian Larsen , John L. Melanson
Abstract: An improved Class-D amplifier may include a digital PWM modulator that receives a digital audio signal and that provides a PWM signal as an input to an analog PWM modulator of the Class-D amplifier. A digital PWM modulator may be configured to receive a digital signal and to generate a first PWM signal based on the digital signal. A digital PWM driver may be coupled to the digital PWM modulator. The digital PWM driver may be configured to receive the first PWM signal and to generate a reference PWM signal based on the first PWM signal. An analog PWM modulator may be coupled to the digital PWM driver. The analog PWM modulator may be configured to receive the reference PWM signal and to generate an output PWM signal based on the reference PWM signal.
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公开(公告)号：US12155380B2
公开(公告)日：2024-11-26
申请号：US18188053
申请日：2023-03-22
Inventor： Ross C. Morgan , Yongjie Cheng , Lingli Zhang
IPC: H03K17/687 , H03K17/06
Abstract: This application relates to methods and apparatus for driving a transducer connected between two output nodes in a bridge-tied-load configuration. A driver receives first and second supply voltages and has charge pumps that generate respective first and second boosted voltages. The driver is operable in a first driver mode in which each output node is modulated between the first and second supply voltage; a second driver mode in which one output nodes is modulated between the first and second supply voltages and the other output node is modulated between either the first boosted voltage and the first supply voltage or between the second supply voltage and the second boosted voltage; and a third driver mode in which one of the output nodes is modulated between the first supply voltage and the first boosted voltage and the other output node is modulated between the second supply voltage and the second boosted voltage.
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公开(公告)号：US12101085B1
公开(公告)日：2024-09-24
申请号：US18188067
申请日：2023-03-22
Inventor： Ross C. Morgan , Joe Walker , Yongjie Cheng , Lingli Zhang
IPC: H03K17/693 , H03K3/017 , H03K17/687
CPC classification number: H03K17/693 , H03K3/017 , H03K17/6871
Abstract: This application relates to methods and apparatus for multichannel drivers for driving transducers in different channels. A multichannel driver has a plurality of output stages configured such that two output nodes can be modulated between selected switching voltages with a controlled duty cycle to generate a differential output signal across a respective transducer, each output stage being operable with different switching voltages in different modes of operation. A first set of two or more of the output stages are arranged to receive a voltage output by a capacitive voltage generator to use as a switching voltage. A controller is configured to control the mode of operation and duty-cycle of each of the output stages based on a respective input signal and also based on operation of the other output stages of the first set.
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公开(公告)号：US10476502B2
公开(公告)日：2019-11-12
申请号：US15582257
申请日：2017-04-28
Inventor： Yongjie Cheng , Lei Zhu , Kyehyung Lee
IPC: H03K19/00 , H03K17/06 , H03K19/04 , H03F1/02 , H03G1/00 , H03K19/094 , H03F3/187 , H03F3/217 , H03F3/45
Abstract: In accordance with embodiments of the present disclosure, a system may include a buffer and a switch coupled between the buffer and a voltage supply such that the switch controls a varying voltage at a varying voltage node coupled to the buffer.
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