Patent ID: 6621337
Filing Date: 2003-09-16
Classification: H03F

Abstract:
An amplifier circuit having a circuit input for a circuit input signal (Vin) to be amplified and an amplification zone for amplifying the circuit input signal (Vin), wherein the amplification zone comprises two amplifiers (OPV1, OPV2), each of which is countercoupled, and to each of which the circuit input signal (Vin) is fed in parallel, and the amplifier outputs (Vout1, Vout2) of which are or can be connected with a circuit output to provide a circuit output signal (Vout), wherein the amplification input zone of one of the two amplifiers (OPV1) is connected with the amplification input zone of the other of the two amplifiers (OPV2) by means of a further amplifier (A), in such manner that signal distortions at the two amplifier outputs (Vout1, Vout2) essentially cancel each other out in the circuit output signal (Vout), wherein the two amplifiers (OPV1, OPV2), including their respective loads, have essentially the same configuration, but the size of the other amplifier (OPV2) and its load differs from that of the first amplifier (OPV1) in accordance with a relative scaling factor (s), and wherein the condition A=1/s+1 is at least approximately fulfilled, where A is the amplification of the additional amplifier and s is the relative scaling factor.