Bandgap voltage reference circuit and method with low TCR resist

Details Bandgap voltage reference circuit and method with low TCR resist Bandgap voltage reference circuit and method with low TCR resist

1992-06-11

1994-03-01

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323907, 3072961, G05F 316

Patent

active

052911225

ABSTRACT:
A bandgap voltage reference circuit includes a low temperature coefficient of resistance (TCR) tail resistor connected in series with a high TCR tail resistor, and a low TCR correction resistor connected in parallel with the high TCR resistor. The ratio of resistance values for the parallel resistors is selected to produce a correction voltage that essentially cancels a Tln(T) output deviation from temperature linearity, where T is absolute temperature. Matching voltage-temperature characteristics are obtained by selecting a resistor ratio at which the rate of change in the circuit's output voltage, both with and without the parallel resistors, is substantially zero at approximately the same temperature. While the shape of the compensation voltage-temperature curve is determined by the resistor ratio, it is scaled to the magnitude of the Tln(T) deviation by an appropriate selection of absolute resistor values. The correction resistor is preferably a trimmable thin film element.

REFERENCES:
patent: 4263544 (1981-04-01), Groendijk
patent: 4808908 (1989-02-01), Lewis et al.
Grebene, Bipolar and MOS Analog Integrated Circuit Design, John Wiley & Sons, 1984, pp. 206-209.

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