A CMOS temperature sensor with calibration function using band gap voltage reference

An accurate temperature sensor was implemented using 0.18um CMOS technology. The temperature sensor which was designed with the bandgap reference circuit is calibrated by trimming common mode voltage of an operational amplifier. The temperature sensor can compensate for other blocks of the IC chip above the special temperature when the ADC was a power off for low power operation. It consumes only 365uA with a 3V supply voltage. This temperature sensor can be calibrated up to a maximum 7 degree. And the average error is −0.8°C in sensing range from −30°C to 90°C in comparison with simulation result.