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ABSTRACT

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A low-cost thermal sensor with sigma-delta ADC was realized in 0.25pm CMOS process. Simplify the circuitry sitma with different technologies to improve the efficiency and Delta igtal Temp. reduce the error in the thermal sensor chip. Substrate npn Bi e Odt transistors are used to sense the temperature and generate the ADC's reference voltage. The ingenious application of sigmadelta ADCs can reduce the complexity of circuit, thereby CLE Control reducing system cost, area and power consumption. Attach importance to the body temperature (37+4°C), from +33 0C to