Precision voltage reference circuit

Details Precision voltage reference circuit Precision voltage reference circuit

1992-06-26

1994-04-05

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323907, 3072966, G05F 316

Patent

active

053008774

ABSTRACT:
A bridge-configured precision voltage reference circuit includes a first voltage supply terminal, a second voltage supply terminal, first and second bridge nodes, and a bridge resistor connected between the first and second bridge nodes. A Zener diode is coupled between the first bridge node and the first voltage supply terminal, and a voltage divider circuit is coupled between the first voltage supply terminal and the second bridge node. An output voltage terminal is coupled to the voltage divider circuit, so that a precision output voltage is derived as a fraction of the voltage differential between the second bridge node and the potential of the first voltage supply terminal. A fixed magnitude current source is coupled between the first bridge node and the second voltage supply terminal, and an adjustable current source is coupled between the second voltage supply terminal and the second bridge node. The adjustable current source supplies a bias current to the voltage divider circuit, so as to establish a prescribed voltage drop thereacross and thereby establish a precision output voltage. A temperature-compensating current supply circuit is coupled to the first and second nodes. At a first calibration temperature, parameters of the temperature-compensating current supply circuit, the adjustable current source and the voltage divider circuit are set such that such that there is no current flow through the bridge resistor and the output voltage is at the desired value. At a second calibration temperature, the value of the bridge resistor is adjusted such that there is a voltage drop across the bridge resistor, so that the output voltage is maintained at its intended value.

REFERENCES:
patent: 4249122 (1981-02-01), Wildar
patent: 4375596 (1983-03-01), Hoshi
patent: 4443753 (1984-04-01), McGlinchey
patent: 4634959 (1987-01-01), Boeckmann
patent: 4677369 (1987-06-01), Bowers et al.
patent: 4868416 (1989-09-01), Fitzpatrick et al.
patent: 4868482 (1989-09-01), O'Shaughnessy et al.
patent: 5198747 (1993-03-01), Haight

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