Abstract
This article is concerned with the study of readout electronics for new-generation acoustic-wave sensors with high sensitivity. An integrated circuit programmable- frequency square wave oscillator is used in open-loop configuration and resonant frequency shift is detected using an undersampling analogue-to-digital converter. Simulated and measured results are reported which show that a simple setup with a low resolution frequency sweep provides sufficient accuracy to detect a frequency difference of less than 1 kHz (0.06% deviation from the nominal frequency), suitable for binary screening applications.
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