A polymer condenser microphone on silicon with on-chip cmos amplifier


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Pedersen, Michael and Olthuis, Wouter and Bergveld, Piet (1997) A polymer condenser microphone on silicon with on-chip cmos amplifier. In: Transducers '97, International Conference on Solid State Sensors and Actuators, June 16-19, 1997, Chicago, USA (pp. pp. 445-446).

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Abstract:In this paper the development of a capacitive microphone with integrated preamplifier is described. The condenser microphone is made by micromachining of polyimide on silicon, and is compatible with CMOS technology. Therefore, the structure can be realised by post processing on substrates containing integrated circuits, independently of the IC process. Microphones with a required DC bias voltage of 4 V have been realised on a CMOS substrate containing PMOS buffer preamplifiers. From the measurements on these structures, it is illustrated how an immediate improvement of 4.8 dB of the microphone sensitivity and noise level can be obtained by using the integrated preamplifier. The measured sensitivity of the integrated condenser microphone was 2.5 mV/Pa and the equivalent noise level (ENL) was 29.5 dB(A) SPL
Item Type:Conference or Workshop Item
Copyright:©1997 IEEE
Link to this item:http://purl.utwente.nl/publications/16878
Official URL:http://dx.doi.org/10.1109/SENSOR.1997.613681
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Metis ID: 113763