Nanopower CMOS sub-bandgap reference with 11 ppm/°C temperature coefficient

Two nanopower CMOS sub-bandgap references have been designed with the Chartered 0.35 mum CMOS process, which generate two precise voltages of 96.6 and 108.9 mV with minimal temperature coefficients of 11.4 and 9.2 ppm/degC, respectively. Both circuits operate properly with a supply voltage down to 1.1 V and a supply current below 26 nA. The power supply rejection ratio for each circuit without any filtering capacitor at 100 Hz and 10 MHz is lower than 60 and 40 dB, respectively.