A nanopower single-trim voltage reference in a 0.13/im digital CMOS process
A nanopower single-trim CMOS voltage reference in SMIC 0.13/xm digital process is proposed. It utilizes a subthresh-old 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 4.82ppm/°C over the operating range from −20 to 80°C and a line regulation of 3.4mV/V over the supply range from 1.2 to 3V. The simulated power consumption is 648nW.