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针对目前超低功耗温度传感器误差大的问题,运用由精确比例电流源偏置的寄生衬底PNP晶体管,采用0.18μm混合信号工艺设计了一种可集成于无源RFID标签的新型高精度温度传感器。传感器核心电路产生与绝对温度成正比的电压信号,通过新型开关电容积分器进行放大,并由改进的12位超低功耗逐次逼近模数转换器完成数字量化。仿真结果表明,单次温度转换时间为4.25ms;在1.8V工作电压下,平均电流为17.5μA;在-37℃~91℃范围内,温度误差为-0.1℃~0.43℃。
In view of the large error of the ultra-low power temperature sensor, a parasitic substrate PNP transistor biased by an accurate proportional current source is used to design a new type of high-precision temperature signal that can be integrated into a passive RFID tag using a 0.18 μm mixed signal process sensor. The sensor core generates a voltage signal proportional to absolute temperature, amplified by a new switched-capacitor integrator, and digitized by an improved 12-bit ultra-low power successive approximation analog-to-digital converter. The simulation results show that the single-time temperature conversion time is 4.25ms, the average current is 17.5μA at the operating voltage of 1.8V, and the temperature error is -0.1 ℃ ~ 0.43 ℃ in the range of -37 ℃ ~ 91 ℃.