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公开(公告)号：US20230378923A1
公开(公告)日：2023-11-23
申请号：US17747845
申请日：2022-05-18
Inventor： Jian Wen , Davide Luigi Brambilla , Qiyu Liu , Mei Yang , Shuming Tong , Francesco Stilgenbauer
CPC classification number: H03G3/3026 , H03G3/348 , H03G3/3036 , H03K4/06
Abstract: In an embodiment, an amplifier circuit includes a second stage that includes a first switch circuit including first and second terminals, a plurality of resistive elements coupled between the first and second terminals of the first switch circuit, and a plurality of switches configured to control an equivalent resistance between the first and second terminals of the first switch circuit. During play mode, the second stage has a gain between the input of the second stage and the output of the second stage of a first value. During a transition from mute mode to play mode, the amplifier circuit is configured to progressively increase the gain of the second stage from a second value to the first value. During a transition from play mode to mute mode, the amplifier circuit is configured to progressively decrease the gain of the second stage from the first value to the second value.
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公开(公告)号：US10917086B2
公开(公告)日：2021-02-09
申请号：US16410857
申请日：2019-05-13
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： Jian Wen , Hong Xia Li , Mei Yang
IPC: H03K17/687 , H03F3/45 , G01R31/30
Abstract: In an embodiment, a power switch controller for driving a back-to-back power switch includes: an amplifier having a supply terminal configured to receive a supply voltage, an output configured to be coupled to a gate terminal of the back-to-back power switch, a first input configured to be coupled a source terminal of the back-to-back power switch, and a second input coupled to the output of the amplifier. The amplifier is configured to generate an output voltage at the output of the amplifier, the output voltage being an offset voltage higher than a voltage at the first input of the amplifier.
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