X-Fab manufactures CMOS MEMS mic

01 October 2006

The world’s first CMOS microelectromechanical systems (MEMS) microphone, developed by Akustica, will be manufactured in Germany by Akustica’s strategic partner, X-Fab, a pure play analogue and mixed signal semiconductor foundry (www.akustica.com and www.xfab.com).

The partnership marks the first semiconductor technology application to produce MEMS microphone chips using a CMOS process flow, for cost-effective microphone solutions in notebook PCs and other digital media devices.

The AKU2000 single chip silicon micropohone includes an acoustic transducer and output amplifier and fourth order sigma delta modulator. Output is PDM (pulse denisty modulated) or can be a single bit digital output stream that is unaffected by radio frequency and electromagnetic interference. Additionally, the output can be decimated by a digital filter in downstream electronics.

The use of a single chip can save real estate and assembly time and also eliminates the dependence on shielded cabling for signal routing. The device supports an input clock frequency of one to 4MHz and operates from 2.8 to 3.6V, consuming >750ìA. The device can consume only 75ìA in power-down mode,
where there is no clock input to the microphone.

This degree of frequency and phase response matching means the microphone can be used where multiple microphones cancel noise or clock input to the microphone.

This degree of frequency and phase response matching means the microphone can be used where multiple microphones cancel noise or are performanced for beamforming.

The device’s footprint of 4 x 4mm is suitable for undermount, surface-mountable microphones in portable digital devices, which are becoming increasingly voice-enabled.


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