公开(公告)号：EP1052831A1

公开(公告)日：2000-11-15

申请号：EP99830296.2

申请日：1999-05-14

Applicant: STMicroelectronics S.r.l.

Inventor： Nicollini, Germano ,  Pernici, Sergio

IPC: H04M1/60 ,  H03G3/34

CPC classification number: H03F1/305 ,  H03G3/348 ,  H04M1/6016

Abstract: The receiving section comprises a final stage (12), an electroacoustic transducer (13) having a first terminal connected to the ground of the circuit, a unit for controlling switching on/off, a source (30) of a reference voltage, a switch (21) which can adopt a first position or a second position in order to connect the second terminal of the transducer (13) selectively, via a capacitor (Cest), to the reference-voltage terminal (REF) or to an output terminal (OUT) of the final stage (12), respectively, and control means (20) which respond to signals (PD) of the unit for controlling switching on/off in order to activate or to deactivate the final stage (12) and the reference-voltage source (30) and to operate the switch (21) in accordance with a predetermined time program.
The receiving section operates with the same immunity to disturbances as a fully balanced structure, even though the transducer (13) is not connected between two balanced outputs.

Abstract translation: 接收部分包括最终级（12），具有连接到电路接地的第一端子的电声换能器（13），用于控制接通/断开的单元，参考电压的源（30），开关 （21），其可以采用第一位置或第二位置，以便经由电容器（Cest）选择性地将所述换能器（13）的第二端子连接到所述基准电压端子（REF）或输出端子 OUT）和控制装置（20），其响应于用于控制开关的单元的信号（PD），以便激活或停用最终级（12）和参考 电压源（30），并根据预定的时间程序操作开关（21）。 即使传感器（13）没有连接在两个平衡输出之间，接收部分也具有与完全平衡的结构相同的扰动抗扰度。