DC AMPLIFIER CIRCUIT AND METHOD FOR MEASURING DC VOLTAGE OF DC AMPLIFIER CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a DC amplifier circuit and a method for measuring a DC voltage of the DC amplifier circuit whereby a DC voltage can be measured in a short time.;SOLUTION: The measurement method includes: a first step for reducing the impedance between an input terminal and an output terminal of a low pass filter circuit 3 included in a DC signal path of the DC amplifier circuit 1 through a bypass comprising a resistor R2 and a switch SW formed between the input terminal and the output terminal; a second step of applying a DC voltage to the input terminal of the DC amplifier circuit 1 in a state of the formation of the bypass; a third step of opening the switch SW to interrupt the bypass after application of the DC voltage to the input terminal of the DC amplifier circuit; and a fourth step of measuring the DC voltage at the output terminal of the DC amplifier circuit after interruption of the bypass so as to measure the DC voltage of the DC amplifier circuit 1.;COPYRIGHT: (C)2004,JPO