公开(公告)号：US20230378923A1

公开(公告)日：2023-11-23

申请号：US17747845

申请日：2022-05-18

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics (Shenzhen) R&D Co. Ltd.

Inventor： Jian Wen ,  Davide Luigi Brambilla ,  Qiyu Liu ,  Mei Yang ,  Shuming Tong ,  Francesco Stilgenbauer

IPC: H03G3/30 ,  H03G3/34 ,  H03K4/06

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.