High-precision Sub-threshold CMOS Voltage Reference with PVT Invariant
WU Ya · Electronics & Packaging · 2015
The paper presents a pure CMOS high precision voltage reference circuit based on the subthreshold MOSFETs with the SMIC 65 nm standard CMOS process technique. Three different types of NMOSFETs and further resister-less temperature compensation are used to reduce process, voltage and temperature(PVT)sensitivity. Simulation result shows that voltage and temperature varies have little effect on the current according different process corners(Vref variation is only ±1.36%). Temperature and power supply sensitivity of the reference voltage is 4.5×10-6℃-1(-500~1 500℃)and 2.1% m V·V-1. In addition, the supply voltage is about 0.56 V.