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US 2018/0005000 A1Published application
Fingerprint detection circuit and electronic device
AssigneeBYD Company Limited
InventorsZhengang LI, Kunping XU, Yun YANG
Life of this patent
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AssigneeBYD Company Limited
InventorsZhengang LI, Kunping XU, Yun YANG
Estimating the term…
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.
A fingerprint detection circuit, configured to apply an excitation signal to a finger so as to generate finger capacitors, the fingerprint detection circuit comprising:
An electronic device, comprising a fingerprint detection circuit configured to apply an excitation signal to a finger so as to generate finger capacitors;
Dependencies are inferred from the claim text.