Title :
A low cost, digital microphone chip
Author :
Houghton, Andy D. ; Mawer, John R. ; Ivey, Peter A.
Author_Institution :
Dept. of Electron. & Electr. Eng., Sheffield Univ., UK
Abstract :
This paper describes a chip that can extract high resolution motion from a surface which is illuminated with laser light. There are many applications for this technology including a fully digital microphone that converts sound into a digital output without A/D conversion of the sound signal. The chip contains about 100,000 transistors, and is fabricated using a 1 μ double metal, single poly process. The complete chip occupies an area of about 25 mm2
Keywords :
application specific integrated circuits; microphones; 1 micron; 25 mm; digital microphone chip; double metal single poly process; laser light illumination; sound signal; surface motion; Costs; Laser noise; Microphones; Optical distortion; Optical noise; Optical signal processing; Optical surface waves; Signal resolution; Speckle; Surface emitting lasers;
Conference_Titel :
Custom Integrated Circuits Conference, 1995., Proceedings of the IEEE 1995
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-2584-2
DOI :
10.1109/CICC.1995.518160
