Journal
INTERNATIONAL JOURNAL OF THERMOPHYSICS
Volume 35, Issue 11, Pages 2124-2139Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10765-014-1715-0
Keywords
Analog front-end; Condenser microphone; Electret microphone; Low-noise preamplifiers; Photoacoustic equipment; Piezoelectric sensor
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This paper is a review of analog front-end circuitry used in photoacoustic equipment with microphone or piezoelectric detection. A block structure of the front end as well as detailed circuit diagrams of preamplifiers dedicated for piezoelectric sensors and measurement condenser and electret microphones are described. The presented circuits are optimized toward low-noise operation. Practical remarks regarding the design of the remaining analog blocks are also given. The analysis shows that it is possible to design an analog front end for which specifications will be comparable with the best commercial solutions.
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