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A CMOS subbandgap reference circuit with 1-V supply voltage is described. To obtain subbandgap reference voltages with a 1-V supply voltage, threshold voltage reduction and subthreshold operation techniques are used. Large ΔVBE (100 mV) as well as a 90-dB operational amplifier are used to circumvent the amplifier offset. A power-on-reset (POR) circuit is used as startup. This circuit has been implemented using a standard 0.5-μm CMOS process, and its size is 940 μm×1160μm. The temperature coefficient is 17 ppm from -40°C to 125°C after resistor trimming and the minimum power supply voltage is 0.95 V. The measured total current consumption is below 10 μA and the measured output voltage is 0.631 V at room temperature.