Abstract

A nanopower single-trim CMOS voltage reference in SMIC 0.13 μm digital process is proposed. It utilizes a subthreshold nMOSFET biased by a proportional to absolute temperature (PTAT) current to generate a negative temperature coefficient (TC) voltage, which is used to obtain a mutual compensating reference voltage together with a PTAT voltage. Simulated results indicate the proposed reference has a temperature coefficient of 4.82 ppm/°C over the operating range from -20 to 80°C and a line regulation of 3.4 mV/V over the supply range from 1.2 to 3 V. The simulated power consumption is 648 nW.

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