Università Di Pisa

—— An extreme low power voltage reference generator operating with a supply voltage ranging from 0.9 to 4 V has been implemented in AMS 0.35 μm CMOS process. The maximum supply current measured at the maximum supply voltage and at 80 °C is 70 nA. A temperature coefficient of 10 ppm/°C is achieved by means of a perfect suppression of the temperature dependence of the mobility, the compensation of the channel length modulation effect on the temperature coefficient and the absence of the body effect. The power supply rejection ratios without any filtering capacitor at 100 Hz and 10 MHz are lower than -53 and -42 dB, respectively. The occupied chip area is 0.045 mm.