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A 400 \mu W Hz-Range Lock-In A/D Frontend Channel for Infrared Spectroscopic Gas Recognition

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3 Author(s)
Stepan Sutula ; Instituto de Microelectrónica de Barcelona IMB-CNM(CSIC), Spain ; Carles Ferrer ; Francisco Serra-Graells

This paper presents a low-power and fully integrated frontend channel for long-wave infrared spectroscopic gas recognition. The proposed channel circuitry includes: input sensor biasing, sub-Hz high-pass filtering and pre-amplification, differential blind cancellation, and lock-in A/D conversion. The proposed CMOS circuits make extensive use of transistor subthreshold operation and digital programmability. Experimental results are presented for a 0.3 mm2 400 μW channel prototype integrated in 0.35 μm CMOS technology.

Published in:

IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:58 ,  Issue: 7 )