In the bipolar difference input step which includes the bipolar difference input step

摘要

The bipolar difference input step which possesses the input bias current offset circuit includes, input pair (Q1 and Q2) and the tracking transistor of bipolar (Q3). As for the input step, input pair (Q1 and Q2) and the tracking transistor (Q3) collector electric current, and input pair in (Q1 and Q2) and the tracking transistor (Q3) collector emitter voltage, is equal substantially mutually. The lateral PNP transistor (Q7) the 1st collector, is necessary in order to obtain substantially equal collector electric current, the tracking transistor (Q3) based electric current is supplied, the 2nd and 3rd collector (Q7), the tracking transistor (Q3) input pair (Q1 and Q2) supplies the copy of based electric current to the base as an offset electric current of bias electric current, input bias current of the input step is decreased with that.