A novel high PSRR bandgap over a wide frequency range

This paper describes a novel bandgap reference with high PSRR over a wide frequency range. The design utilizes an internally regulated supply voltage without high gain feedback loop. Thus improve PSRR even at high frequency. Additional transistors are added to further improve supply rejection and minimize the second order effect. The circuit is implemented in 0.25 μm CMOS technology. It generates a reference voltage of 1.262 V which has a voltage variation versus temperature of 0.1% from -20 C to 90 C. It has a PSRR of 85 dB at 1 kHz and still 64 dB at 1MHz.