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This paper proposes a CMOS oscillators-based smart temperature sensor with a SAR (Successive Approximation Register) search algorithm. To reduce the cost and release the number of bits, a temperature-dependent delay circuit (TDDC) composed of a thermal ring oscillator and a fixed-gain time amplifier was used to generate a thermal sensing delay proportional to the test temperature. An adjustable reference delay circuit (ARDC) composed of another thermal compensation ring oscillator and an adjustable-gain time amplifier was used to program a reference set-point delay. For digital output coding, a SAR control logic was adopted for selecting the optimal reference delay of the ARDC to approximate the thermal delay of the TDDC through the help of a time comparator. The chip size of the proposed oscillators-based sensor with 11 output bits was 0.25 mm2, which is less than the 0.6 mm2 of its delay-line-based predecessor with a 10 output bits in the same 0.35-μm TSMC CMOS process [1]. The measurement errors were within ±0.6°C in the temperature range of 0°C to 90°C after two-point calibration for eight packaged chips

A CMOS Oscillators-Based Smart Temperature Sensor for Low-Power Low-Cost Systems