CMOS voltage reference based on weighted ΔV_(GS)
Jin Dongming · Journal of Tsinghua University(Science and Technology) · 2006
The power consumption in CMOS voltage references is often excessive.This paper describes a voltage reference based on the CMOS sub-threshold characteristics that requires less power.By using the weighted difference between the gate-source voltages of an NMOS and a PMOS operating in the saturation region,the resulting output voltage has a very low temperature coefficient and a high power supply rejection ratio since the current supplied to the voltage source is based on the MOSFETs operating in the sub-threshold region.The voltage source was fabricated with the mixed-signal technology of(0.18) μm of semiconductor manufacturing international corporation(SMIC).Measurements show that the temperature coefficient is only 2.5×10~~(-5)/℃ between 21℃ to 110℃.The voltage source works well when V__(DD) is above 1.4 V.The power supply rejection ratio is-57 dB.