| 摘要 |
The present invention is applicable to the technical field of fingerprint detection, and provides a fingerprint detection circuit. The fingerprint detection circuit comprises: a first conducting layer, a second conducting layer, an inverting amplifier comprising a single input end coupled to the first conducting layer and an output end coupled to the second conducting layer, and a switch unit used for creating a direct-current operating point of the inverting amplifier, one end of the switch unit being coupled to the input end of the inverting amplifier, and the other end of the switch unit being coupled to the output end of the inverting amplifier. According to the present invention, a single-input single-output inverting amplifier is used, and a direct-current operating point of the inverting amplifier is rapidly and accurately created, so that a capacitance value of a sensing capacitor is accurately converted into an output signal; meanwhile, an additional biasing circuit does not need to be configured, so that a circuit structure is simple, and the accuracy is high. |
