Precision bandgap reference circuit

Details Precision bandgap reference circuit Precision bandgap reference circuit

1997-04-22

1999-05-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327513, 327541, 327543, 323313, 323315, 323316, G05F 110

Patent

active

059007737

ABSTRACT:
A precision bandgap reference circuit which uses an operational amplifier that has the positive and negative input terminals connected to a diode/resistor combination and a diode respectively. The output of the operational amplifier drives a diode connected PMOS transistor which regulates current sources which drives into the diode/resistor combination and the diode inputs to the operational amplifier. This allows the operational amplifier to have enough gain to minimize errors across the diode/resistor combination and the diode inputs to the operational amplifier. This also allows an output stage driven by the operational amplifier to be biased with a Proportional To Absolute Temperature (PTAT) current which is well controlled.

REFERENCES:
patent: 4593208 (1986-06-01), Single
patent: 4978868 (1990-12-01), Giordano et al.
patent: 5087830 (1992-02-01), Cave et al.
patent: 5614816 (1997-03-01), Nahas
patent: 5666046 (1997-09-01), Mietus

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