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A Thermistor-Based Temperature Sensor for a Real-Time Clock With 2 ppm Frequency
基于多晶硅热敏电阻的温度传感器设计,用于实时时钟频率补偿
0.12°C精度,2ppm频率稳定性,0.09mm²面积,31μW功耗
温度传感器热敏电阻Wien桥锁频环实时时钟
▸创新点1:采用集成多晶硅热敏电阻作为温度传感核心元件(方法创新)。相比传统分立式热敏电阻,集成设计显著减小了面积(0.09 mm²),同时通过半导体工艺实现良好的一致性,为后续校准奠定基础。
▸创新点2:首创将Wien桥RC滤波器嵌入锁频环的系统架构(系统创新)。通过温度依赖的相位变化直接调制输出频率,省去了传统ADC环节,在32ms转换时间内实现2.8mK(rms)高分辨率,功耗仅31μW。
▸创新点3:提出3点校准方案实现±0.12°C(min-max)精度(方法创新)。针对多晶硅热敏电阻的非线性特性,通过精简校准点实现宽温域(-40°C~85°C)内2ppm频率稳定度,显著降低量产测试成本。
▸创新点4:温度-频率直接转换机制(电路创新)。通过石英晶体振荡器的温度补偿应用验证,将传感器输出直接转化为时钟频率校正信号,建立完整的温度补偿实时时钟系统解决方案。
Abstract
This paper describes the design of a temperature
sensor based on integrated pol y-silicon thermistors. The th er-
mistors are incorporated in a Wien-bridge RC filter, which, in
turn, is embedded in a frequency- locked loop. The loop's output
frequency is then determined by the filter's tempera ture-de-
pendent phase shift, thus realizing an energy-efficient and high
resolution temperature sensor. After a 3-point calibration, the
sensor achieves an in accuracy of less than
0.12 C( m i n -max)
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