Abstract: Based on the low voltage PTAT bandgap reference and bulk-driven low voltage operational amplifier, a novel low voltage high precision CMOS current reference is implemented.The supply, temperature and technology characteristics are simulated by TSMC 0.25μm CMOS Spice models.When the supply voltage rages from 1.0～1.8V, the output current is equal to 12.437～12.497μA at room temperature.When the temperature ranges from 0～47℃, the output current is also equal to 12.447μA.The maximal absolute current error of technology is equal to 0.54μA, and the relative error to the normal output current is 4.34%.

Key words: current source, CMOS, bulk driven