公开(公告)号：US11621683B2

公开(公告)日：2023-04-04

申请号：US17162229

申请日：2021-01-29

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Wei Xu ,  Ravi Kummaraguntla ,  Paul Wilson ,  Mujo Kozak ,  Christian Larsen ,  John L. Melanson ,  Yongjie Cheng

IPC分类号： H03F3/45

摘要： 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.

公开(公告)号：US10812074B2

公开(公告)日：2020-10-20

申请号：US16582528

申请日：2019-09-25

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Yongjie Cheng ,  Lei Zhu ,  Kyehyung Lee

IPC分类号： H03K19/00 ,  H03F1/02 ,  H03K17/06 ,  H03G1/00 ,  H03F3/187 ,  H03K19/094 ,  H03F3/217 ,  H03F3/45

摘要： 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.

公开(公告)号：US10476502B2

公开(公告)日：2019-11-12

申请号：US15582257

申请日：2017-04-28

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Yongjie Cheng ,  Lei Zhu ,  Kyehyung Lee

IPC分类号： H03K19/00 ,  H03K17/06 ,  H03K19/04 ,  H03F1/02 ,  H03G1/00 ,  H03K19/094 ,  H03F3/187 ,  H03F3/217 ,  H03F3/45

摘要： 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.

公开(公告)号：US10581322B2

公开(公告)日：2020-03-03

申请号：US15783506

申请日：2017-10-13

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Eric J. King ,  Aaron J. Brennan ,  Christian Larsen ,  John L. Melanson ,  Yongjie Cheng ,  Adrian Colli-Menchi

IPC分类号： H02M3/07 ,  H03F1/02 ,  H03F3/213 ,  H02M1/32 ,  H03F3/187 ,  H02M1/00 ,  H03M1/66 ,  H03F3/21

摘要： 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.

公开(公告)号：US10164590B2

公开(公告)日：2018-12-25

申请号：US15910774

申请日：2018-03-02

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Lingli Zhang ,  Yongjie Cheng ,  Lei Zhu ,  Christian Larsen ,  John L. Melanson

IPC分类号： H03F3/217 ,  H03F3/183

摘要： 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.