Implementation of a 1 volt supply voltage CMOS subbandgap reference circuit

This paper presents a CMOS subbandgap reference circuit with a 1 V power supply voltage. To obtain a subbandgap reference voltage with a 1 V supply voltage, threshold voltage reduction and subthreshold operation techniques are aggressively used. Large Δ 0.631V_BE (100 mV) as well as a 90 dB operational amplifier are used to circumvent amplifier offset problem. This circuit is implemented using a 0.5 μm CMOS standard process without special process modification and its size is 1370 μm×1390 μm. The temperature coefficient of this circuit is 17 ppm from -40 °C to 125°C after resistor trimming, and the minimum operation 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.