A High-PSRR CMOS Bandgap Reference Circuit

The paper presents a high power supply rejection ratio (PSRR) CMOS bandgap reference (BGR). The circuit adopts a pre-regulator. To facilitate comparison, BGRs with- and without- pre-regulator are, respectively, designed and simulated in the 0.13 μm standard CMOS process technology. Simulation results show that the PSRR of the designed BGR with pre-regulator achieves, respectively, −107.3 dB, −106.6 dB and−75 dB at 100 Hz, 1 kHz and 100 kHz, while PSRR of BGR without pre-regulator has only, respectively, −70.6 dB, −70.5 dB and −65 dB at 100 Hz, 1 kHz and 100 kHz. The BGR with pre-regulator achieves a bandgap voltage reference of 0.76 V, a temperature coefficient of 0.55 ppm/°C in the temperature range from −25 °C to 125 °C, and a deviation of output voltage of 0.08 mV when the power supply voltage changed from 2.6 V to 6.2 V.