Patent ID: 7898332

Claim:
A semiconductor integrated circuit device comprising: an amplifier circuit which has one or more input terminals, one or more output terminals, and a first bias terminal, and in which a first current or voltage DC signal and a first current or voltage AC signal are superimposed on each other so as to be inputted into the one or more input terminals; a replica circuit which has the same DC characteristics as the DC characteristics of the amplifier circuit, to which a second current or voltage DC signal is inputted, and which has a second bias terminal; a reference voltage generation circuit which is connected to the second bias terminal of the replica circuit, and which generates a predetermined reference voltage at the second bias terminal; and a feedback circuit which takes a difference between the reference voltage generated at the second bias terminal of the replica circuit and the voltage generated at the first bias terminal of the amplifier circuit, and which performs feedback control by providing negative feedback of the difference to the first bias terminal of the amplifier circuit so that the voltage generated at the first bias terminal of the amplifier circuit is made equal to the reference voltage generated at the second bias terminal of the replica circuit.