0.6-V supply voltage references for CMOS technology based on threshold-voltage-difference architecture

A group of low-voltage power supply voltage references has been developed. The circuits are designed with the assumptions that the difference of threshold voltages is nearly constant in the wide range of temperatures, and that mobilities are tracking each other with temperature. The circuits are obtained by substitution of transistors with different thresholds in the same basic configuration that produces the output voltage proportional to the difference of transistor threshold voltages. The best result achieved in simulations shows that one can obtain the output voltage of 332 mV plusmn 2mV in the range of temperatures 0 to 75 degC and with variation of power supply voltage from 1.8 V down to 0.6 V