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Micropower Voltage Reference

2015-03-16 16:57  
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A low-drift voltage reference can be easily made by convertinga zero temperature coefficient current to a voltage.JFETs biased slightly below pinch-off exhibit a zero temperaturecoefficient drain current (ID) as shown in Figure 1. Withthe above property and a micropower operational amplifier,used to convert the drain current to a voltage, a low powerconsumption voltage reference can be built as shown inFigure 2. The consumption of LM4250 op amp is programmedthrough resistor RSET. Potentiometer P1 should beadjusted for low output (VREF) temperature coefficient. visit page.