Implementation of a Low TC High PSRR CMOS Bandgap Voltage Reference Circuit

In this paper, a new low temperature coefficient (TC) high power supply rejection ratio (PSRR) bandgap voltage reference is presented in CMOS technology. In order to achieve low TC and high PSRR voltage reference with small area overhead and good practicability, the proposed circuit uses a curvature correction method based on sub-threshold current and a PSRR enhancement circuit. When the power supply voltage is 3.3V, this circuit is devised and verified using 0.18 mu m CMOS process. The results show the output voltage is constant at 1.247V at room temperature. The output voltage range is 0.674 mV and TC is 3.029ppm/degrees C in a wide temperature range of -55 degrees C to 125 degrees C. The measured PSRR is 98.36dB at lKHz and more than -44.28 dB at 1MHz.