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The Evolution of Integrated Interfaces for MEMS Microphones
Piero Malcovati1, Andrea Baschirotto2
1Department of Electrical, Computer, and Biomedical Engineering, University of Pavia, 27100 Pavia, Italy. piero.malcovati@unipv.it.
Abstract:
Over the last decade, MEMS microphones have become the leading solution for implementing the audio module in most portable devices. One of the main drivers for the success of the MEMS microphone has been the continuous improvement of the corresponding integrated interface circuit performance in terms of both dynamic range and power consumption, which enabled the introduction in mobile devices of additional functionalities, such as Hi-Fi audio recording or voice commands. As a result, MEMS microphone interface circuits evolved from just simple amplification stages to complex mixed-signal circuits, including A/D converters, with ever improving performance. This paper provides an overview of such evolution based on actual design examples, focusing, finally, on the latest cutting-edge solutions.
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