Design of a fast start-up bandgap voltage reference with high PSRR
Based on 5 V 0.35 μm CMOS process,this paper proposes a bandgap voltage reference cir-cuit suitable for low-noise and high-speed systems.In order to ensure that the circuit has a higher power supply rejection ratio(PSRR),a negative feedback loop is designed to suppress the fluctuation of the power supply,and a two-stage amplifier structure with higher gain is used in the circuit.A fast start-up circuit is designed to meet the requirements of some high-speed systems for the start-up se-quence.When the power supply starts to be turned on,the fast start-up circuit directly acts on the reference voltage,which accelerates the start-up of the bandgap reference.After the bandgap voltage reference is normally started,the start-up circuit stops working by turning off the transistors quickly.According to the simulation results,the proposed bandgap voltage reference has a temperature drift coefficient of 13.05 × 10-6 ℃-1 between-40 ℃ and 125 ℃ and the PSRR at low frequency is 100.6 dB.In addition,its line regulation(LNR)and starting time are 0.024 mV/V and 4 μs,respec-tively.
power supply rejection ratio(PSRR)fast start-upbandgap voltage referencenegative feedback looptemperature drift coefficientline regulation(LNR)
万方数据
维普
