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

摘要

Amplifier circuit with an adjustable gain values, comprising:– a signal input (i) for supplying a signal;– a signal output (o) for providing an amplified signal;– a control input (3l) for supplying a control signal for a change in amplification;– a control circuit (21) for the change in amplification, the with the control input (3l) is coupled;– a first amplifier stage (v1) and at least one second to the first amplifier stage connected in parallel with the amplifier stage (v1 ''), which in each case between the signal input (i) and the signal output (o) are arranged and in each case comprising a first gain factor, as well as a switching input for gain adjustment, which is connected with the control circuit (21) is coupled;characterized by– at least a third amplifier stage (v2), the parallel to the first amplifier stage between the signal input (i) and the signal output (o) and is disposed at a second gain factor, as well as a switching input to the control circuit (21) is coupled;– the control circuit comprising a first control unit (211) is formed..