BASE LINE STABILIZING CIRCUIT

摘要

PURPOSE:To find the correct crest value of a detection object pulse signal even when a noise component which has a relatively high level as compared with the wave height value of the detection object pulse signal is mixed by lowering output impedance. CONSTITUTION:The values of resistances R1 and R2 are selected properly to make an amplification factor nearly constant. A field effect transistor FET is normally held closed and the voltage at the output-side point A of a voltage holding circuit composed of an operational amplifier A2 is held as high as the voltage at the inverted input terminal of an operational amplifier A1. A resistance R5 and a capacitor C2 form an integration circuit so as to compensate completely even the level variation of a noise component when the field effect transistor FET is open.