Reference voltage generator of a band-gap regulator type used in CMOS transistor circuit

摘要

A reference voltage generator of the so-called band-gap regulator type is disclosed, which includes a pair of bipolar transistors, a resistor circuit coupled to the bipolar transistors to make them operative in different current densities from each other to thereby produce a voltage relative to a difference in base-emitter voltage between the transistors, and an operational amplifier coupled to receive the voltage to control a current flowing through the resistor circuit, and further includes a level shifter inserted between the resistor circuit and the operational amplifier to receive and shift the voltage from the resistor circuit, the level shifter thereby shifting the voltage to produce a level-shifted voltage and the operational amplifier receiving the level-shifted voltage.