Title :
The CapSense design in portable media players
Author :
Wang, Qiuhong ; Chen, Dehua
Author_Institution :
Mech. Dept., Changzhou Mech. & Electron. Technol. Coll., Changzhou, China
Abstract :
The adoption of capacitive sensing as an interface technology in portable media players and mobile handsets has created demand for the same technology in more conventional consumer electronics. Demand has led to significant innovation and several competitive technologies are available. While these technologies each have their respective differences, the underlying principle is the measurement of capacitance between a plate (the sensor) and its environment. Sensing techniques can employ ADCs, comparators, and switching mechanisms. In the case of limited number on sense, the demand with high resolution & credible sensitivity is choke point in technology. The 2-levels filter arithmetic is put forward in the paper, which is applied to reduce great the noise on sense channel. It is always stable, and offer higher performance for the case of limited number on sense.
Keywords :
analogue-digital conversion; capacitance measurement; capacitive sensors; comparators (circuits); consumer electronics; filters; multimedia systems; sensitivity; switching circuits; 2-level filter arithmetics; ADC; CapSense design; capacitance measurement; capacitive sensing; comparators; consumer electronics; interface technology; mobile handsets; noise reduction; portable media players; sensitivity; switching mechanisms; 2-levels filter arithmetic; capacitive sense; pwm; the capacitance to voltage convenor;
Conference_Titel :
IT in Medicine and Education (ITME), 2011 International Symposium on
Conference_Location :
Cuangzhou
Print_ISBN :
978-1-61284-701-6
DOI :
10.1109/ITiME.2011.6130771
