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On the theoretical maximum achievable signal-to-noise ratio (SNR) of piezoelectric microphones
Yoonho Seo1, Daniel Corona1, Neal A Hall1
1Microelectronics Research Center / Department of Electrical and Computer Engineering, The University of Texas at Austin, 10100 Burnet Road, Bldg. 160, Austin, TX 78758, United States.
Abstract:
A theoretical maximum achievable signal to noise ratio (SNR) for piezoelectric microphones is identified as a function of only microphone volume irrespective of architecture and construction details. For a given piezoelectric material, microphone SNR can be reduced to an expression containing only a dimensionless coupling coefficient and microphone volume. For a given material, the coupling coefficient has a theoretical upper bound defined by the most favorable deformation geometry. The ability to identify a theoretical maximum SNR as a function of only microphone size is surprising considering the numerous design variables and infinite design freedom afforded in the microphone design stage.
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