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 150 mV. Since most of MOSFETs are working at sub-threshold region, the circuit only consumes 976 nW at supply voltage of 1 V with PSRR of -51.68 dB at room temperature using TSMC 0.18 mum technology. The reference voltage's average temperature coefficient is 26.67ppm/degC in the range [-25, +125]degC and its variation is 3.6 mV/V for supply voltage from 0.8 to 2.5 V.