Design of high power supply rejection voltage reference with wide input voltage

Abstract

This paper proposes a high power supply rejecttion (PSR) bandgap voltage reference using a CSMC 0.5um BCD process. The temperature coefficient of this circuit achieves 16.93∼19.02 ppm/°C over a range of −40∼125 °C when the input voltage is 4∼36 V. Better PSR can be achieved since the potentials of critical nodes are not changed. The bandgap reference voltage is located in a negative feedback loop, which is suitable for the design of a high PSR reference. In addition to a wide input range, the methods used to improve the PSR also provide good line regulation. This voltage reference provides a PSR of −132dB∼−98dB at dc and −54.7dB∼−55.5dB at 1MHz, a line regulation of 0.009%/V with a supply voltage between 4 V and 36 V, which meets the requirements of dc-to-dc converter applications.