Method of determining very small capacitances
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United States of America Patent
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Jun 24, 2003
Issued Date -
N/A
app pub date -
Jan 23, 2001
filing date -
Jul 23, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A grid of capacitor surfaces is connected to read lines and control lines. The read lines are connected alternately to the output of a feedback operational amplifier and to a collecting capacitor. The capacitances to be measured are charged repeatedly and the charges are collected on the collecting capacitors. Between the charging operations, the potential on the read lines is kept constant through the use of the low-resistance output of the operational amplifier. The use of this method in the case of a fingerprint sensor makes it possible to evaluate all the read lines together.
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