Amplifier circuit with adjustable discrete gain, the use of the amplifier circuit and method for operating a value-discrete adjustable amplifier

摘要

It is an amplifier circuit is given, in which a first amplifier stage (v1) and at least a second amplifier stage (v1 '') in each case between signal input (i) and signal output (o) are arranged. They are fitted with a first gain factor is designed as well as a switching input. In addition, the amplifier circuit a third amplifier stage (v2) with a second gain factor, the between signal input (i) and signal output (o) is arranged. A control circuit (21) to set the gain is to each amplifier stage (v1, v2) coupled. The control circuit has a first control unit (211), designed for a single ended signal processing, and a second control unit, designed for a against clock signal processing, on. In the case of a change in amplification of the first and at least one second amplifier stage (v1, v1 ''), it is for the supply of control signals of the first control block (211) to the amplifier stage (v1, v1'') and, in the case of a change in amplification of the at least one third amplifier stage (v2) for the supply of control signals of the second control block to all amplifier stages (v1, v1 '', v2) is formed.