A 0.8 V low-power CMOS PTAT voltage reference

The fundamental principles of the substrate bipolar transistor in CMOS technology and the bulk-driven MOSFET are discussed and analyzed. Based on the bulk-driven PMOSFET, substrate PNP transistor and current feedback technique an 0.8 V low power PTAT voltage reference is proposed for the temperature sensors applications. At a 0.8 V power supply with -25∼130 °C temperature range, the temperature coefficient of voltage reference is 0.926 mV/K, and the supply current is about 4.5 μV. When the power supply ranged 0.7 V∼1.0 V, the voltage reference is about 302 mV in the room temperature. The active area of reference is about 0.01 mm².