A CMOS Voltage Reference with Temperature Sensor using Self-PTAT Current Compensation

An all-CMOS circuit for combined voltage reference and temperature sensor is proposed. For voltage reference design, a self-PTAT current is generated for compensating a diode-connected NMOS transistor for achieving temperatureindependent purpose. In addition, an ultra linear temperature sensor can be realized and achieved simultaneously. The circuit topology is very suitable for SoC integration. The voltage reference provides a stable voltage for analog circuit. Moreover, the temperature sensor increases the system reliability by predicting eventual faults caused by excessive chip temperatures.