公开(公告)号：US20040150461A1

公开(公告)日：2004-08-05

申请号：US10703099

申请日：2003-11-06

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Yann Desprez-Le Goarant ,  Kok-Yong Tan

IPC: H03K017/60

CPC classification number: H03K17/6257

Abstract: An audio signal switch has a plurality of inputs and an output. Each input is arranged to be selectively connected to the output via a respective transmission chain, each transmission chain includes: a first bipolar transistor, of a first type, connected to the input; a second bipolar transistor, of a second type, complementary to said first configuration, connected to the output; and an intermediate bipolar transistor, of the second type, connected between said first and second transistors. The first and second transistors are arranged in an emitter-follower circuit configuration, and the intermediate transistor is arranged to act as a diode to protect the first transistor from a large reverse voltage applied to its base-emitter junction.

Abstract translation: 音频信号开关具有多个输入和输出。 每个输入被布置为经由相应的传输链选择性地连接到输出，每个传输链包括：连接到输入的第一类型的第一双极晶体管; 与所述第一配置互补的第二类型的连接到所述输出的第二双极晶体管; 以及连接在所述第一和第二晶体管之间的第二类型的中间双极晶体管。 第一和第二晶体管被布置成射极跟随器电路配置，并且中间晶体管被配置为充当二极管，以保护第一晶体管免受施加到其基极 - 发射极结的大的反向电压。