The design of sub-threshold reference circuit using resistor temperature compensation

A reference circuit employing sub-threshold current is presented, which uses two CTAT currents and resistor temperature compensation to generate a reference voltage of 200mV. Since most of MOSFETs are working at sub-threshold region, the circuit only consumes 716nW at supply voltage of 1V with PSRR of −53.5dB at room temperature using TSMC 0.18µm technology. The reference voltage's average temperature coefficient is 25ppm/° in the range [−25, +125]° and its variation is 2.26mV/V for supply voltage from 0.8 to 2.5V.