Design of Voltage Source References for AC/DC Controller
Qunchao Chen · Telecom Power Technology · 2011
A novel voltage reference is proposed in this paper which can use in AC/DC controller.When a diode-connected MOS transistor is biased with a PTAT(proportional to absolute temperature) current source,the gate-source voltage of such transistor can be temperature independent because of mutual compensation of mobility and threshold voltage temperature variations.The structure of this circuit is very simple: neither start-up circuit nor Op amp.It can avoid the impact of the Op amp offset voltage to the reference.The circuit of design uses CSMC 0.5 μm BCD technology,and the circuit simulations are shown that the voltage references have low temperature coefficient and high PSRR.It can be used as a voltage reference for hysteresis comparator in AC/DC controller.