A Dual-Output Voltage Reference for high-accuracy pipelined ADC

A dual-output voltage bandgap reference has been designed for high-accuracy pipelined ADC with CSMC0.6 process technology in this work. Based on the temperature and noise analyzing of voltage reference, the traditional circuit has been improved. The structure with two PN junctions in series,non-operational amplifier structure and PTAT (proportional to absolute temperature) current supplied by ldquoself-biasrdquo cascode current mirror, were adopted in the circuit designed. A new method to divide voltage was suggested in this study. The simulation results showed that the dual-output voltages were 2.194 V and 1.098 V respectively when temperature varied from -10 degC to 100 degC, and the temperature coefficient is only 7.00 ppm/degC; the change of V_ref only was 5.326 mV, and the PSRR was 49.3 dB when source voltage varied from 6 V to 9 V. The dual-output voltage reference of the circuit designed can meet the requirement of comparator input voltage in high-accuracy pipelined ADC.