Bandgap voltage reference circuit

Details Bandgap voltage reference circuit Bandgap voltage reference circuit

1991-10-30

1993-09-14

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Self-regulating

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

323315, 3072961, 3072966, 36518909, G05F 326

Patent

active

052452735

ABSTRACT:
A bandgap voltage reference circuit (50, 100) which operates at low power supply voltages provides a reference current as either a one- or a two-.DELTA.V.sub.BE voltage across a first resistor (82, 133). A current proportional to the reference current is mirrored into one terminal of a second resistor (94, 133) to provide the bandgap voltage. Compensation for base currents injected into the circuit (50, 100) by two transistors forming the .DELTA.V.sub.BE reference is provided. In one embodiment (50), base currents of first (66) and second (87) transistors which have equal emitter areas and collector current density as the two transistors (68, 85) forming the .DELTA.V.sub.BE reference compensate for the injected base currents. In another embodiment (100), a single transistor (127) injects current substantially equal to the sum of the base currents of the two transistors (116, 121) forming the .DELTA.V.sub.BE reference. The single transistor (127) has twice the emitter area of one of the transistors (116) forming the .DELTA.V.sub.BE reference.

REFERENCES:
patent: 4342926 (1982-08-01), Whatley
patent: 4896094 (1990-01-01), Greaves et al.
patent: 5045773 (1991-09-01), Westwick et al.
patent: 5126653 (1992-06-01), Ganesan et al.
Gray, Paul R. and Meyer, Robert G., Analysis and Design of Analog Integrated Circuits, Second Edition, John Wiley & Sons, Inc. 1984, Chapter 12, p. 716.

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