Chopper amplifier

Abstract

Abstract PURPOSE:To obtain a chopper amplifier which is constituted so as to eliminate the spike noise caused by the switching of the switch. CONSTITUTION:Switches S1 and S2 are formed with, for example, the FET with the common connection secured at the drain side to amplifier A2. Switches S3 and S4 feature the same constitution and are connected to reverse amplifier A2. Switches S1 and S4 plus S2 and S3 are driven by the same driving pulse CL and CL respectively. In this connection, the spike noise of the same waveform is generated if the uniform characteristics is secured between switches S1 and S4 plus S2 and S4 each. And the spike noise receives the inverse amplification for switches S3 and S4. Accordingly, the spike noise is offset between amplifiers A1 and A2 at addition point P of the output if the amplification factor is identical between the both amplifiers.

Inventors

• 👤 Masaoki Ishikawa

Bibliographic Details