Electronics design of piezo-resistive MEMS microphone arrays for aero-acoustics in flight tests

The front-end electronics design for a MEMS microphone array is presented for aero-acoustic applications. It is compliant with the requirements of flight tests: 40 Hz – 10 kHz bandwidth, 130 dB dynamic range, compensated from ambient temperature change (95ºC) and pressure change (80 kPa) during the tests. A multiplexing approach is adopted to reduce the signals distribution of an 80 elements array with piezo-resistive microphones. Considerations for a digital output sensing system are included.