Band-gap reference current source with compensation for saturati

Details Band-gap reference current source with compensation for saturati Band-gap reference current source with compensation for saturati

1994-12-02

1996-12-03

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323314, G05F 316, G05F 320

Patent

active

055811744

ABSTRACT:
A reference current source for generating a reference current (Irf) includes a bipolar first transistor (2) and a bipolar second transistor (4), the base of the first transistor (2) being coupled to the base of the second transistor (4), a first resistor (6) connected between the emitter of the first transistor (2) and the emitter of the second transistor (4), and a second resistor (8) connected between the emitter of the second transistor (4) and a supply terminal (10). The current source also includes a measurement circuit (16) having inputs (12, 14) coupled to the collector of the first transistor (2) and the collector of the second transistor (4), and having a measurement output (18) for supplying a measurement signal in response to a difference in the collector current of the first transistor (2) and the second transistor (4), a bipolar third transistor (28) having its base coupled to the measurement output (18), having its emitter coupled to the bases of the first (2) and the second transistor, and having a collector supplying the reference current (Irf), and a bipolar fourth transistor (34) having its base coupled to the base of the third transistor (28), and having its emitter connected to the emitter of the third transistor (28) via a base pinch resistor (36). The base pinch resistor (36) provides compensation for variations in the reference current (Irf) caused by spread in the saturation current of the bipolar transistors.

REFERENCES:
patent: Re30586 (1981-04-01), Brokaw
patent: 4339707 (1982-07-01), Gorecki
patent: 4808908 (1989-02-01), Lewis et al.
patent: 5029295 (1991-07-01), Bennett et al.
"A Simple Three-Terminal IC Bandgap Reference", IEEE Journal of Solid-State, vol. SC-9, No. 6, Dec. 1974, A. P. Brokaw, pp. 388-393.
"Analysis and Design of Analog Integrated Circuits", Second Edition, John Wiley & Sons, Chapter 4, Appendix A4.3.2.

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