| 摘要 |
A voltage reference element such as a zener diode 1 is supplied with at least two different current values during time periods t<SB>1</SB>, t<SB>2</SB>. One value is an optimum bias current 8 which ensures desired reference voltage characteristics, and the other value 9 results in a required zener operating temperature which is lower than if the first current value were applied continuously. The zener voltage is applied to a sample and hold circuit 14 which samples the voltage during the first time period. A temperature control loop may be included in the circuit (Fig.3).
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