Voltage generator for generating a stable voltage independent of

Details Voltage generator for generating a stable voltage independent of Voltage generator for generating a stable voltage independent of

1993-05-07

1994-11-01

Sterrett, Jeffrey L.

Electricity: power supply or regulation systems

Self-regulating

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

323315, 323901, 323907, G05F 326

Patent

active

RE0347728

ABSTRACT:
A stable reference voltage generator using a current mirror circuit comprising a primary branch and a secondary branch, is shown and described. A first bipolar transistor (Q1) has its collector connected in series with the primary branch of the current mirror, and a voltage divider bridge comprising at least two series-connected resistors (R1, R2), is connected in series between the secondary branch of the current mirror and the collector of a second bipolar transistor (Q2). The base of the second transistor (Q2) is connected to the common point of the series resistors, the base of the first transistor (Q1) is connected to the collector of the second transistor (Q2), and the output of the generator (V.sub.REF) is connected to the terminal of the bridge opposite that connected to the collector of the second transistor (Q.sub.2). The geometry of said transistors being such that the first transistor (Q1) is equivalent to "N" transistors identical to the second transistor (Q2) connected in parallel. An isolation bipolar transistor (Q7) is connected in series between the primary branch of the current mirror circuit and the first transistor, the collector of the latter being connect to the emitter of the isolation transistor.

REFERENCES:
patent: 3940760 (1976-02-01), Brokaw
patent: 4029974 (1977-06-01), Brokaw
patent: 4063149 (1977-12-01), Crowle
"Line Voltage Rejection in a Bandgap Voltage Reference," IBM Tech. Discl. Bul., vol. 30, No. 4, pp. 1424-1425, Sep. 1987.
IEE Proceedings, Sec. A a I, vol. 131, No. 6, Dec. 1984, Stevenage, GB, pp. 242-244, R. W. Barker; "Low-Voltage Rail-Supply-Insensitive PTAT Current Generator".

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