Method of and system for compensating for injection gradient in a capacitive sensing circuit array
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United States of America Patent
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Nov 16, 2004
Grant Date -
N/A
app pub date -
Apr 4, 2000
filing date -
Apr 4, 2000
priority date (Note) -
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Abstract
A fingerprint sensor includes an array comprising a plurality of capacitive pixel cells. Each of the capacitive pixel cells includes a pair of metal plates and a reset transistor. The reset transistor includes a gate, a source connected to one of the metal plates and a drain connected to the other of the metal plates. A reset buffer generates a reset signal. A regenerator is associated with each reset transistor of each capacitive pixel cell. The regenerator regenerates the reset signal received from the reset buffer to eliminate injection gradient over the array.
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