Interaction of threshold voltage and mobility temperature dependencies applied to stabilization of current and voltage

Abstract

Mutual compensation of mobility and threshold voltage temperature variations may result in a zero temperature coefficient (ZTC) bias point of an MOS transistor. In this case the temperature dependence of the output voltage for a diode-connected transistor is a linear function of absolute temperature with the slope controlled by bias current. The paper describes application of this temperature dependence to stabilization of current and voltage in reference circuits. Examples of design for 0.18 /spl mu/m CMOS technology, and the circuit simulations are provided.