A low temperature drift and low voltage bandgap reference is designed for a new uncooled infrared focal plane array (IRFPA) readout circuit. The technique which can be used to provide both reference voltage output and reference current output is proposed. By modifying the bandgap load and reference core circuit in the bandgap reference circuit, the reference voltage and current can be compensated for temperature respectively. When using a 0.5 μm N well CMOS technology, simulation is carried out by using the Spectre software. The result shows that the temperature coefficients of the voltage output and the current output are 35.6 ppm/℃ and 37.8 ppm/℃ respectively in the temperature range from -20 ℃ to 100 ℃ at 3.3 V. The power-supply rejection ratio (PSRR) is -68 dB at DC. The circuit can operate in the range from 2.2 V to 4.5 V.