一种基于斩波技术的热电堆读出电路设计  

A Readout Circuit for Thermopile Based on Chopper Technique

作　　者：陈铖颖[1] 黑勇[1] 范军[1] 胡晓宇[1] 戴澜[2] 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]北方工业大学信息学院,北京100144

出　　处：《固体电子学研究与进展》2013年第4期371-376,共6页Research & Progress of SSE

基　　金：国家科技重大专项资助项目(Y1GZ212001);国家自然科学基金资助项目(61001052)

摘　　要：设计了一款基于斩波技术的热电堆读出电路。读出电路包括前端放大器和2阶1bit量化Sigma-Delta调制器,其中前端放大器采用闭环结构,保证了不同温度下的增益稳定性;此外,在前端放大器和2阶1bit Sigma-Delta调制器中同时引入斩波技术,降低低频噪声和失调电压的影响,实现了较高的检测精度。读出电路采用SMIC 0.18μm 1P6M CMOS工艺实现,测试表明,在电源电压3.3V、1Hz输入信号和3kHz时钟频率下,信噪失真比(SNDR)55.4dB,有效位数(ENOB)达到8.92bit,在-20～85°C温度范围内,可检测约0.2°C的温度变化。A readout circuit for thermopile is presented in this paper, which includes ampli- fier and 2hal-order 1 bit quantization Sigma-Delta modulator. The amplifier with closed-loop struc- ture ensures the gain stability against the temperature. Moreover, by adopting chopper technique both for the amplifier and 2hal-order 1 bit quantization Sigma-Delta modulator, the low-frequency noise and offset are reduced and high resolution is achieved. The readout is implemented in SMIC 0.18μm 1P6M CMOS process. The measurement results show that in 3.3 V power supply, 1 Hz input frequency and 3 kHz clock frequency, the SNDR is 55.4 dB, ENOB is 8.92 bit, and in the range of --20 to 85 ℃, the detection accuracy is about 0.2 ℃.

关 键 词：热电堆 斩波 放大器 调制器 

分 类 号：TN492[电子电信—微电子学与固体电子学] TN722