A high performance CMOS band-gap reference circuit design

This paper presents a CMOS band-gap reference design, which possesses the characteristics of low noise and high power supply rejection capability. Thus, it is suitable for the applications of a wide range of frequency and power input. In order to reduce thermal noise and to provide the output reference voltage that is resistant to power supply variations, the design incorporates an RC filter into conventional reference structure. Moreover, a fast turn-on circuit is introduced into the design to improve turn-on time of the circuit. The simulation results show that within the frequency range from 100 Hz to 10 MHz, the design has achieved an average power supply rejection ratio (PSRR) of more than 80 dB and an average noise of 8.5 μVrms. With the fast turn-on circuit, the improved band-gap reference circuit can reach its steady state within 100 microseconds.