Temperature-compensated zener voltage reference

Details Temperature-compensated zener voltage reference Temperature-compensated zener voltage reference

G - Physics

05

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328/199, 323/4

G05F 1/10 (2006.01) G05F 1/56 (2006.01) G05F 1/567 (2006.01) G05F 3/18 (2006.01)

Patent

CA 1217230

ABSTRACT OF THE DISCLOSURE A precision voltage reference comprising an IC chip having a Zener diode connected to the input of an operational amplifier, Variations in output with tempera- ture are minimized by selectively controlling the Zener current in accordance with temperature. The current is controlled by a resistive circuit including a thermistor connected in parallel with the Zener. A method of trimming the voltage reference is provided wherein an optimum quiescent operating current is determined based on voltage and current measurements at two different temperatures.

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