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A nanopower switched-capacitor CMOS sub-bandgap voltage reference has been implemented using a Chartered 035-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 mm~2.
A nanopower switched-capacitor CMOS sub-bandgap voltage reference has been implemented using a Chartered 035-μm 3.3-V / 5-V dual gate mixed-signal CMOS process. The proposed circuit generates a precise sub-bandgap voltage of 1 V. temperature coefficient of the output voltage is 13.4 ppm / ° C. with the temperature varying from -20 to 80 ° C. 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.