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MEMS measurement microphone compatible to P48 amplifiers.

F Huber¹, F Toth¹

¹Institute of Mechanics and Mechatronics, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria.

|February 21, 2025

Summary

This study introduces a low-cost pre-amplifier for micro-electromechanical systems (MEMS) microphones, enabling high-precision audio measurements. The design offers a compact, adaptable solution for professional audio applications.

Keywords:

Experimental acoustics IEC 61938 Low-cost Phantom power Pressure sensor Transducer

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Area of Science:

Electrical Engineering
Acoustics
Audio Engineering

Background:

Micro-electromechanical systems (MEMS) microphones are widely adopted in consumer electronics for their cost-effectiveness, performance, and manufacturing consistency.
There is a need for affordable, high-precision pre-amplifiers compatible with MEMS microphones and professional audio standards (IEC 61938).

Purpose of the Study:

To design and validate a cost-effective pre-amplifier for interfacing MEMS microphone capsules with IEC 61938 pro-audio equipment.
To create a compact pre-amplifier suitable for integration into standard 1/2-inch or 12mm housings, serving as a direct replacement for commercial measurement microphones.

Main Methods:

Detailed circuit design and comprehensive theoretical calculations.
Extensive simulations to predict pre-amplifier performance characteristics.
Experimental measurements and performance validation using a commercially available MEMS capsule in a controlled acoustic environment.

Main Results:

The pre-amplifier design demonstrates excellent performance metrics through calculations, simulations, and real-world measurements.
Testing confirmed the device's capability for high-precision audio measurement and recording when paired with a MEMS capsule.
The design's adaptability to various MEMS capsules is supported by a detailed circuit description.

Conclusions:

The developed pre-amplifier offers a high-performance, low-cost solution for professional audio measurements using MEMS microphones.
The compact and adaptable design facilitates integration into existing measurement setups, replacing commercial alternatives.
The study provides a robust foundation for utilizing MEMS technology in precision audio applications.