| 摘要 |
PURPOSE:To obtain a desired input/output characteristic by outputting a sum signal generated based on a difference signal between input/output signals of a main path circuit in addition to an output signal of the main path circuit. CONSTITUTION:An adder circuit 21 giving an output of a difference signal SR between an input signal S1 and an output signal S0 and a signal processing circuit 26 sending an output signal Ss whose level varies with the difference signal SR, are provided. Then the difference signal SR between the input signal S1 and the output signal S0 of an amplitude modulation circuit 3 is added to the output signal S0 via a signal processing circuit 26 and the result is outputted. Thus, a sum signal S01 changed with a desired input/output characteristic is outputted in comparison with the output signal S0. Thus, the desired input/output characteristic is obtained with simple constitution. |
