Cmos subthreshold reference circuit with low power consumption and low temperature drift

Abstract

A resistorless CMOS low power voltage reference circuit is provided. The start-up circuit is used to prevent the circuit to stay in the zero state and stop working when the circuit gets out of the zero state. The self-biased Vgenerating circuit generate the voltage Vwhich has positive temperature coefficient. The square-law current generating circuit generates a square-law current which is proportional to μTthrough the V. Finally, the reference voltage Vis obtained by introducing the square-law current into the reference voltage output circuit. The reference voltage Vof this application can realize approximative zero temperature coefficient in the temperature range of −40° C.100° C. This application improves temperature characteristic which may be poorer due to temperature nonlinearity of carrier mobility based on the traditional subthreshold reference. This application can reduce the power consumption from μW level to nW level and realize low power consumption.