A Low Power Bandgap Voltage Reference Circuit with PSRR Enhancement

This paper presents a low power high PSRR bandgap voltage reference (BGR) circuit. Two concepts for PSRR enhancement are investigated and evaluated in this work. The designed BGR circuit operates with 2.7 V and generates a reference voltage of 1.26 V. The BGR circuit provides -82.6 dB power supply rejection ratio (PSRR) at 1 MHz and the PSRR at DC region is also below -80 dB. The PSRR enhancement is implemented by using a low power low drop out voltage regulator (LDO) integrated into the BGR circuit. The overall current consumption of the design is less than 60 muA.