Variable voltage reference using feedback control technique

Abstract

This paper is devoted to describe a voltage reference circuit which employs a feedback control technique to achieve a stable reference voltage. It has a facility to obtain any reference voltage in the range of 0.7V to 1.4V with high stability. As an example, it has been shown through simulations that a voltage reference for 0.73V with a temperature stability of about 1 ppm/°C over the temperature range of 0 to 80°C is possible. Proposed voltage reference circuit is simulated using transistor models of 0.18-µm CMOS process.