A Low-power Temperature Sensor Design Based On CMOS Technology

The integrated temperature sensor has the advantages of small area,low cost,low power consumption,etc.It is widely used in the fields of cold chain logistics,medical industry and fire safety.Therefore,designing a temperature sensor based on CMOS technology is very important.In this paper,a low-power temperature sensor is designed under the TSMC 0.18?m process.The temperature sensor is designed to include a temperature sensing section and a successive approximation analog-to-digital converter(SAR ADC).The temperature detecting circuit uses a vertical parasitic bipolar transistor to obtain a positive temperature coefficient voltage and a negative temperature coefficient voltage,and generates a temperature signal with a wide voltage variation range by a suitable ratio,and uses a high-order compensation technique to generate a temperature independent one.The reference voltage and temperature information are collected and then analog-to-digital converted using a SAR ADC.The simulation results show that the temperature sensor has a power supply voltage of 1.8V,a temperature range of-40? to85?,a temperature coefficient of 1.17ppm/?,a temperature measurement error of less than±0.6?,and a sampling rate of 10kS/for a 10-bit SAR ADC,SNR is 56.43dB,SFDR is 60.45dB,ENOB is 9.08 bits,the overall power consumption of the temperature sensor is 448?W,and the layout area is 0.089mm~2.