Author/Editor		Trontelj, Janez; Pleteršek, Anton; Kunc, Vinko
Title		A CMOS low noise integrated circuit for capacitive sensor interface
Type		članek
Source		In: Miklavčič D, Bajd T, Stanič U, editors. Proceedings of the 9th international conference on mechanics in medicine and biology; 1996 Jun 30-Jul 4; Ljubljana. Ljubljana: Slovenian society of medical and biological engineering,
Publication year		1996
Volume		str. 492-6
Language		eng
Abstract		Fully integrated single chip high sensitivity accelerometer sensor (g-sensor) without any external components can be a valuable device for a number of biomedical instruments. Such device micromachined according to the advanced high technology is presented in the paper. A low noise, low power and low distotion CMOS interface is presented that measure a very low capacitance of the integrated capacitive detector/sensor. Such an integrated system is suitable as implant with its basic function of a distance and movement detection and measurement. The basis of moving measurement is a detection of a voltage difference on a very small sensor/capacitor elemnt. Its absolute value vary for few aF. The integrated circuit incorporates voltage sensitive preamplifier stage, calibration circuit, synchronous rectifier and timing circuit. it is implemented in a 0.8 microm double poly n-well CMOS technology.
Descriptors		ACCELERATION BIOMECHANICS