Abstract: The design of a compatible wide-range low-power smart temperature sensor based on the CMOS sub-threshold characteristic is presented for the purpose of on-chip temperature measure and protection from overheating.Simulated with CSMC 0.6μm mixed-signal CMOS technology,the circuit works well over the temperature range from -50 to 150℃.For the amplifier feedback,it has a high power supply rejection ratio under VDD from 2 to 6V.Measurements support the simulation result. The temperature sensitivity is 0.77V/℃.The power dissipation of the sensor is 16μA because the bias current is generated by the CMOS sub-threshold characteristic.The chip area is 300μm×250μm.The characteristics of this sensor make it especially suitable for low-cost high-volume integrated microsystems over a wide range of fields,such as computer,automotive,and biomedical.

Key words: temperature sensor, temperature protecting circuit, power supply rejection ratio, temperature sensitivity