Voltage reference circuit with breakpoint compensation

Details Voltage reference circuit with breakpoint compensation Voltage reference circuit with breakpoint compensation

1992-06-22

1994-07-05

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307310, 3072961, 3072966, 307270, 323313, 323315, G06G 710, H03K 326, H03K 301, G05F 316

Patent

active

053270282

ABSTRACT:
A voltage reference circuit includes a band-gap reference circuit for providing a reference voltage and having breakpoint compensation to adjust the temperature coefficient of the reference voltage as a function of temperature. A thermal limit transistor biased by a voltage having a positive temperature coefficient begins conducting when the operating temperature reaches a predetermined value to provide a compensation current. The compensation current is added to the collector current flowing into one of a pair of transistors within the band-gap reference circuit, and a current controlled current source responds to an increase in collector current in the other one of the pair of transistors by making the collector currents flowing into both transistors equal. This increases the voltage drop across a pair of resistors to increase a band-gap voltage across a portion of an output divider network, to in turn increase the reference voltage provided across the entire divider network.

REFERENCES:
patent: 4734593 (1988-03-01), Teymouri et al.
patent: 4945259 (1990-07-01), Anderson
patent: 4990864 (1991-02-01), Kwan
patent: 5013934 (1991-05-01), Hobrecht et al.
patent: 5051686 (1991-09-01), Schaffer
patent: 5053640 (1991-10-01), Yum

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