A high precision bandgap reference voltage and current source circuit which was applied to analog-to-digital conversion was designed.With the help of temperature compensation technology,the circuit respectively produced a zero temperature coefficient reference voltage VREF and current IZTAT.Simulating results show that when the circuit uses a standard 0.18 μm CMOS technology,at room temperature 27 ℃,2.8 V power supply,working frequency are 10 Hz and 1 kHz respectively,the power supply rejection ratios of th...