This paper presents a CMOS subbandgap reference circuit with 1V power supply voltage. To obtain subbandgap reference voltage with lVolt supply voltage, threshold voltage reduction and subthresholdoperation techniques are aggressively used. Large A VBE (100rnV) as well as 90dB operational amplifier are used to circumvent amplifier offset problem. This circuit is implemented using 0.5 pm CMOS standard process without special process modification and its size is 1370 pm x 1390 pm. The temperature coefficient of this circuit is 17 ppm from -40 OC to 125 "C after resistor trimming, and the minimum operation power supply voltage is 0.95V. The measured total current consumptionis below 10pA and the measured output voltage is 0.631V at room temperature.
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