A 55-dB SNDR,2.2-m W double chopper-stabilized analog front-end for a thermopile sensor  

作　　者：陈铖颖 胡晓宇 范军 黑勇 

机构地区：[1]Institute of Microelectronics,Chinese Academy of Sciences

出　　处：《Journal of Semiconductors》2014年第5期80-85,共6页半导体学报（英文版）

基　　金：supported by the Research on Information Technology of a New Generation of Strategic Leading Scientific and Technological Special System(No.XDA06020401)

摘　　要：A double chopper-stabilized analog front-end （DCS-AFE） circuit for a thermopile sensor is presented, which includes a closed-loop front-end amplifier and a 2nd-order 1 bit quantization sigma-delta modulator. The amplifier with a closed-loop structure ensures the gain stability against the temperature. Moreover, by adopting the chopper-stabilized technique both for the amplifier and 2nd-order 1-bit quantization sigma-delta modulator, the low-frequency 1/f noise and offset is reduced and high resolution is achieved. The AFE is implemented in the SMIC 0.18 μm 1P6M CMOS process. The measurement results show that in a 3.3 V power supply, 1 Hz input frequency and 3KHz clock frequency, the peak signal-to-noise and distortion ratio （SNDR） is 55.4 dB, the effective number of bits （ENOB） is 8.92 bit, and in the range of -20 to 85 degrees, the detection resolution is 0.2 degree.A double chopper-stabilized analog front-end （DCS-AFE） circuit for a thermopile sensor is presented, which includes a closed-loop front-end amplifier and a 2nd-order 1 bit quantization sigma-delta modulator. The amplifier with a closed-loop structure ensures the gain stability against the temperature. Moreover, by adopting the chopper-stabilized technique both for the amplifier and 2nd-order 1-bit quantization sigma-delta modulator, the low-frequency 1/f noise and offset is reduced and high resolution is achieved. The AFE is implemented in the SMIC 0.18 μm 1P6M CMOS process. The measurement results show that in a 3.3 V power supply, 1 Hz input frequency and 3KHz clock frequency, the peak signal-to-noise and distortion ratio （SNDR） is 55.4 dB, the effective number of bits （ENOB） is 8.92 bit, and in the range of -20 to 85 degrees, the detection resolution is 0.2 degree.

关 键 词：THERMOPILE chopper-stabilized amplifier MODULATOR 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN929.533[自动化与计算机技术—控制科学与工程]