Nano-Watt Voltage References for High Supply Voltages

This paper presents two voltage reference circuits that can operate in the supply voltage range of 7-17V and 9-15V while consuming less than 3.5 nA at 17V supply voltage and 8.47 nA at 15V supply voltage. The proposed voltage references consist of only MOSFETs, operated in the subthreshold region since low power consumption is required. The circuits have a mean reference voltage of 2.413V and 2.507V with the best temperature coefficient (TC) being 80 ppm/oC and 24 ppm/oC, respectively. The proposed voltage references were designed in XFAB XH018 180nm technology occupying an area of 0.079 mm2 and 0.038 mm2, respectively.