A 1.3 ppm/°C BiCMOS bandgap voltage reference using piecewise-exponential compensation technique

摘要

A high-order curvature-compensated BiCMOS bandgap voltage reference using piecewise-exponential compensation technique is presented in this paper. The circuit utilizes a variable gain current mirror to realize exponential compensation as well as a common emitter amplifier with local feedback to achieve a second correction. Implemented in 0.5-μm BCD process, the proposed voltage reference consumes a supply current of 17.5 μA at 2.5 V. A temperature coefficient(TC) of 1.3 ppm/°C, PSRR of more than 76 dB at low frequencies and a line regulation of 160 ppm/V from 2.5 to 5 V are easily achieved, which make it applied widely in portable equipments.