Patent ID: 9571046
Date: 2017-02-14
CPC Classifications: H03F,H04R

Claim:
1. An amplifier circuit for a two-wire interface, comprising: an input terminal for the application of an input signal; an output terminal for coupling out an output signal; a reference voltage terminal for the application of a reference potential; a first resistor; a second resistor; a first current path, comprising a voltage-controlled current source with a control terminal, wherein the control terminal of the voltage-controlled current source of the first current path is connected to the input terminal; a second current path, comprising a voltage-controlled current source, wherein the voltage-controlled current source of the second current path is connected in series to the second resistor; and a third current path, comprising a voltage-controlled current source having a control terminal, wherein the first and second current paths are arranged in a parallel circuit, wherein the first resistor and the parallel circuit of the first and second current paths are connected in series between the output terminal and the reference voltage terminal, wherein the third current path is connected between the output terminal and the reference voltage terminal, and wherein the control terminal of the voltage-controlled current source of the third current path is fed back to the first current path without an interconnection with the second current path.