Bandgap voltage reference generator

Details Bandgap voltage reference generator Bandgap voltage reference generator

1993-12-29

1996-04-30

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323907, 327539, G05F 330

Patent

active

055128173

ABSTRACT:
A bandgap voltage generator using a simple bandgap voltage reference supply circuit which has virtually no power supply rejection ratio (PSRR) which can produce an output bandgap voltage, V.sub.BG, using an extremely low power supply voltage, V.sub.DD. In order to increase the PSRR, a signal generated by the bandgap voltage reference supply circuit is amplified by a high gain amplifier circuit comprised of two cascode connected FETs. The highly amplified signal generated by the high gain amplifier circuit drives a voltage regulator, comprised of an FET used as a voltage controlled current sink, which regulates the voltage supplied from the power supply, V.sub.DD, to the bandgap voltage reference supply circuit. This combination of a bandgap voltage reference with virtually no PSRR and a high gain amplifier results in a bandgap voltage generator with a very high PSRR.

REFERENCES:
patent: 4839535 (1989-06-01), Miller
patent: 4849684 (1989-07-01), Sonntag et al.
patent: 5168210 (1992-12-01), Thus
patent: 5245273 (1993-09-01), Greaves et al.
patent: 5309083 (1994-05-01), Pierret et al.
patent: 5391980 (1995-02-01), Thiel et al.

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