Capacitive sensing circuit for sensing capacitance variation with charge clone
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 2, 2016
Grant Date -
May 28, 2015
app pub date -
Jun 10, 2014
filing date -
Nov 28, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a capacitive sensing circuit, comprising at least one capacitor to be measured, an integral capacitor, a first current mirror having a first current path and a second current path. A first current is generated in the first current path so as to charge the capacitor to be measured, while a second current mirrored from the first current is generated in the second current path so as to charge the integral capacitor. As such, the mirrored current, resulted from mirroring the charging current on the capacitor to be measured, is used to charge the integral capacitor. Charge energy charged on the capacitor to be measured may be copied onto the integral capacitor so as to reflect a voltage signal. Subsequently, capacitance variation generated when the capacitor to be measured is touched may be sensed by detecting the voltage signal.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully