“This is an expansion of the established high volume bare die MEMS and ASIC business model with our packaging partners around the world,” said Dr. Roland Helm, Senior Director and Head of Product Line Sensors for Infineon’s Power Management and Multimarket Division. “We will continue to strengthen and grow our business with our partners with bare dies; additionally we now address low noise high-end use cases with our two new packaged microphones.”
Current MEMS microphone technology uses a sound wave actuated membrane and a static backplate. Infineon’s dual backplate MEMS technology uses a membrane embedded within two backplates thus generating a truly differential signal. This allows improved high frequency immunity for better audio signal processing and increases the acoustic overload point of ten percent Total Harmonic Distortion (THD) to 135 dB SPL.
The SNR of 70dB is an improvement of 6dB compared to a conventional MEMS microphone. This improvement is equivalent to doubling the distance from which a user can give a voice command that is captured by the microphone. Additionally, the analogue and digital microphones have excellent microphone-to-microphone matching (±1dB sensitivity matching and ±2° phase matching) which is suitable for implementing in arrays. For this reason the MEMS microphones are a suitable fit for ultra-precise beam forming and noise cancelling.