Abstract: A nanopower switched-capacitor CMOS sub-bandgap voltage reference has been implemented using a Chartered 0.35-μm 3.3-V/5-V dual gate mixed-signal CMOS process. The proposed circuit generates a precise sub-bandgap voltage of 1 V. The temperature coefficient of the output voltage is 13.4 ppm/℃ with the temperature varying from –20 to 80 ℃. The proposed circuit operates properly with the supply voltage down to 1.3 V, and consumes 150 nA at room temperature. The line regulation is 0.27%/V. The power supply rejection ratio at 100 Hz and 1 MHz is –39 dB and –51 dB, respectively. The chip area is 0.2 mm².

Key words: nanopower