CMOS circuit for providing a bandcap reference voltage

Details CMOS circuit for providing a bandcap reference voltage CMOS circuit for providing a bandcap reference voltage

1996-05-17

2000-02-08

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327543, G05F 302

Patent

active

060231890

ABSTRACT:
A low voltage submicron CMOS circuit (10) for providing an output bandgap voltage (V.sub.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 a 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.sub.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.

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