A Low Power Time-Domain CMOS Temperature Sensor

초록

The proposed temperature sensor is composed of serial inverter chain and time-to-digital converter(TDC) instead of proportional to absolute temperature(PTAT) and analog-to-digital converter(ADC) for reducing current consumption. The generated temperature dependent delay is compared with temperature insensitive clock. The proposed temperature sensor's temperature resolution is under 0.2 degrees C and draw current is under 800 nA from a 1.8V supply voltage. The simulated temperatre range is 0 similar to 100 degrees C and temperature error is-within +/- 2 degrees C. The simulated results are trimmed by 2-point calibration. The chip is fabricated using a 0.18 mu m CMOS process.

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