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A Resistorless CMOS Non-Bandgap Voltage Reference

Mary Ashritha, Ebin M Manuel

A resistorless CMOS nonbandgap voltage reference, which is compatible with 180nm CMOS Technology is presented in this paper. In order to reduce the temperature nonlinearity in proposed voltage reference, threshold voltage and a proportional to absolutely temperature (PTAT) voltage form the basic linear temperature components, which are achieved by resistorless threshold voltage extractor and differential difference amplifier. Besides, a self-biased current source is used to provide stable bias currents for the whole voltage reference, which can improve the power-supply noise attenuation (PSNA). Verification results of the proposed voltage reference simulated with 180nm CMOS technology demonstrate that the temperature coefficient (TC) of 10.5ppm/C with a temperature range of -20C to 80C is obtained at 1.8V power supply, and a PSNA of 86.2dB is achieved without any filtering capacitor while dissipating a maximum supply current of 22mA. The active area is 48.685mm47.645mm.