REFERENCE VOLTAGE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a reference voltage circuit whose power supply rejection ratio is large even when power supply voltage is low. SOLUTION: Even when the power supply voltage of a power supply terminal 10 becomes low, an NMOS71 operates in a non-saturation state, and an output resistance ro71 of the NMOS71 becomes low, the power supply rejection ratio PSRRLFis increased as an amplification degree Ao for a differential amplifier circuit 60 is increased. Therefore, even when the minimum operation voltage of the reference voltage circuit is low, the power supply rejection ratio PSRRLFcan be increased. In other words, the amplification degree Ao of the differential amplifier circuit 60 contributes to the power supply rejection ratio PSRRLF, so that the power supply rejection ratio PSRRLFis also increased as the amplification degree Ao for the differential amplifier circuit 60 is increased. COPYRIGHT: (C)2009,JPO&INPIT