DIFFERENTIAL DC AMPLIFIER

摘要

PROBLEM TO BE SOLVED: To reduce drift in the output DC potential caused by the temperature change or the like concerning a differential DC amplifier to be used for an oscilloscope or the like. SOLUTION: In the fig.1, using an operational amplifier 25, the output DC potential of the differential DC amplifier is compared with a predetermined DC potential and fed back to the bases of PNP transistors 5 and 7 comprising the differential DC amplifier so that the output DC potential of the differential DC amplifier can be kept constant.