Design of Low Supply Voltage Bandgap Voltage Reference with Novel Bias Circuit
Jianhui Wu · Dianzi qijian · 2006
This paper proposes a bias circuit for cascode current mirror in band-gap voltage reference to realize low supply voltage. The bias circuit using a MOS transistor which always operate in linear region to bias the two transistors of the cascode stage operating at the edge of saturation to improve the output voltage swing and subsequently low down the supply voltage. Prototype of the band-gap reference in this paper is fabricated using the 0.25 μm CMOS process of Chartered corp, and the simulation results using Hspice tools validate the strategy for designing the bias network. The minimum supply voltage of this reference is 2V, and the temperature coefficient is 12×10 -6/℃ and PSR is -98 dB in the frequency from 1 Hz to 10 kHz and -40 dB from 1 MHz to 1 GHz.