一种高精度低功耗数字温度传感器

A High Precision and Low Power Digital Temperature Sensor

提出了一种高精度低功耗数字温度传感器。采用内部寄生PNP管进行感温。设计了一种14位高精度Σ-ΔADC,将前端感温单元输入的与温度相关的电压信号转换为数字信号,在数字域尺度变换,并最终输出。与使用传统逐次逼近型SAR ADC内核的温度传感器相比,提出的数字温度传感器具有更低的功耗。该传感器采用0.18μm CMOS工艺设计并流片。测试结果表明,测温精度为±0.7℃(-55℃~125℃),芯片面积为1.2 mm^(2)。

A high precision and low power digital temperature sensor was presented.An internal parasitic PNP was used to sense the temperature.A 14-bit high precisionΣ-ΔADC was designed to convert the voltage signal,which was generated by the front temperature sensing module,into the digital signal.Then the signal was normalized in digital domain at the final output.Compared with the temperature sensors adopting a traditional SAR ADC core,the proposed digital temperature sensor achieved lower power consumption.This circuit was designed and implemented in a 0.18μm CMOS technology.The measurement results indicated that the temperature accuracy was±0.7℃(at-55℃~125℃),and the chip area was 1.2 mm^(2).