Fingerprint detection circuit and electronic device
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United States of America Patent
Stats
-
Jul 9, 2019
Grant Date -
Jan 4, 2018
app pub date -
Jan 5, 2016
filing date -
Feb 13, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fingerprint detection circuit and an electronic device are provided. The fingerprint detection circuit is configured to apply an excitation signal to a finger so as to generate finger capacitors, and the fingerprint detection circuit includes: a signal amplifier having a negative input terminal connected with one of the finger capacitors, a positive input terminal connected with a ground terminal, and an output terminal to output an output voltage according to a capacitance value of the one of the finger capacitors; a capacitor connected between the negative terminal and the output terminal of the signal amplifier; a rheostat; and a switch unit connected with the rheostat in series and configured to control the rheostat to be connected with the capacitor in parallel, such that the output voltage has a non-linear relationship with the capacitance value of the one of the finger capacitors.
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