A 0.85v, 4.9 Ppm/Degrees C Inherent Temperature Compensated Voltage Reference With-82 Db Psrr

A novel high PSRR and inherent temperature compensated CMOS voltage reference is present. A resistorless self-biased current source (RLSBCS) is proposed, formed by a gate-source voltage division (GSVD) structure, to achieve a temperature compensated proportional threshold-voltage difference. Meanwhile, a self-cascode structure is adopted to further cancel the residual negative temperature dependence of proposed threshold-voltage difference. Besides, feedback and self-bias techniques are introduced to enhance PSRR. The temperature coefficient is 4.9 ppm/degrees C in the temperature range of -25 degrees C to 75 degrees C and PSRR at DC is -82 dB with a power consumption of 9.8 nW.