A Floating CMOS Bandgap Voltage Reference For Differential Applications

The first floating CMOS bandgap voltage reference is presented. The circuit is very suitable for precision applications in fully differential analog circuits. lt generates a continuous time low impedance voltage of 2.48V ± 24 mV before trimming. The experimental prototype occupies 1800 mils square and dissipates 6 mW with a single supply voltage of 5V. Temperature stability is better than 20 ppm/C over a temperature range from 0 to 100 degree. The measured high frequency power supply rejection of-50 dB at 100KHz is the best ever reported.