摘要 |
PROBLEM TO BE SOLVED: To provide a CMOS operational amplifier which has small offset drift and also does not need additional circuits. SOLUTION: This PN input type operational amplifier consists of a pair of PMOS transistors QP1 and QP2 for a differential input and a pair of NMOS transistors QN1 and QN2 for a differential input. Then, a Vth drift of the pair of the PMOS transistors QP1 and QP2 for a differential input and the pair of the NMOS transistors QN1 and QN2 for a differential input is set, so as to make offset drift small.
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