Fig. 1.
Structure of DCS-AFE circuit
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| Citation: |
Chengying Chen, Xiaoyu Hu, Jun Fan, Yong Hei. A 55-dB SNDR, 2.2-mW double chopper-stabilized analog front-end for a thermopile sensor[J]. Journal of Semiconductors, 2014, 35(5): 055003. doi: 10.1088/1674-4926/35/5/055003
C Y Chen, X Y Hu, J Fan, Y Hei. A 55-dB SNDR, 2.2-mW double chopper-stabilized analog front-end for a thermopile sensor[J]. J. Semicond., 2014, 35(5): 055003. doi: 10.1088/1674-4926/35/5/055003.
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A 55-dB SNDR, 2.2-mW double chopper-stabilized analog front-end for a thermopile sensor
doi: 10.1088/1674-4926/35/5/055003
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Abstract
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.-
Keywords:
- thermopile,
- chopper-stabilized,
- amplifier,
- modulator
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References
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