A 14-/spl mu/A 3-ppm//spl deg/C CMOS bandgap voltage reference

Abstract

The work presented in this paper improves on a high order curvature-compensated CMOS band-gap reference circuit design. A cascoded current mirror is utilized in order to increase the bandgap voltage's power supply rejection ratio (PSRR) and decrease the mismatch current. A source follower is inserted in series with the capacitor to guarantee the system stable. Simulated in the standard 0.18mum CMOS technology, the proposed voltage reference can operate down to 1.5V supply and consumes supply current of 14muA. A temperature coefficient of 3-ppm/degC is achieved through the temperature-dependent resistor ratio