A high PSRR bandgap voltage reference with piecewise compensation

This paper describes an alternative high power supply rejection ratio (PSRR) bandgap voltage reference (BGR) circuit with piecewise compensation. A proportional to absolute temperature (PTAT) current structure with high loop gain is adopted to achieve high PSRR, a current proportional to absolute temperature square (PTAT(2)) circuit is used to implement the temperature piecewise compensate. Experimental results of the proposed BGR implemented in a 0.5 mu m CMOS process demonstrate that a PSRR of 83 dB is achieved, and a temperature coefficient (TC) of 8.83 ppm/degrees C over a temperature range of 165 degrees C (-40 degrees C-125 degrees C) is realized.