CMOS circuit for providing a bandgap reference voltage

摘要

A low voltage submicron CMOS circuit (10) for providing an output bandgap voltage (V_BG) that is substantially independent of temperature and power supply variations has been provided. The CMOS circuit utilizes parasitic transistors (28-30) to create a delta voltage that has positive temperature coefficient across a differential pair of NMOS transistors (14, 16). This delta voltage is then converted into differential currents which are amplified and mirrored and summed together to provide an output current (I_O) that has a positive temperature coefficient. This output current is then passed through a series network including a resistor element (52) and a parasitic PNP junction transistor (31) to provide a bandgap voltage of 1.2 volts wherein the voltage across the resistor element has a positive temperature coefficient and the voltage across the parasitic PNP junction transistor has an inherent negative temperature coefficient.