Electronic fingerprint sensor with differential noise cancellation
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United States of America Patent
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-
Dec 2, 2008
Grant Date -
Feb 8, 2007
app pub date -
Jul 19, 2005
filing date -
Jul 19, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
Image sensing apparatus includes an image pickup plate disposed generally orthogonally with respect to an expected direction of movement of an object, such as a finger, multiple image drive plates in spaced relation to the image pickup plate to define sensor gaps between respective image drive plates and the image pickup plate, and a reference plate disposed substantially parallel to the image pickup plate. The reference plate is spaced from the image pickup plate to permit common mode noise and coupling to be cancelled and is spaced from the image drive plates to permit a differential image signal to develop between the image pickup plate and the reference plate. A differential amplifier coupled to the image pickup plate and the reference plate provides noise cancellation. The apparatus may further include a comb plate spaced from the reference plate and coupled to a reference potential, such as ground.
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