Pixel sensing circuit with common mode cancellation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 14, 2012
Grant Date -
May 14, 2009
app pub date -
Nov 11, 2008
filing date -
Nov 13, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved biometric data sensing circuit, for example adapted for fingerprint sensing, uses a charge subtraction technique at the input of the circuit integrator to cancel the so called “common mode” signal from the circuit output. The result is an output signal that is (a) linear, (b) free from any amplification effect due to the presence of the detected object (e.g. a finger), and (c) indicative of the detected object's fine surface geometry (i.e., indicative of the fingerprint's ridges and valleys).
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