Capacitive fingerprint identification system, electronic equipment and fingerprint identification method

• Main Authors: JIANG XINXI, CHENG ZHENJUAN, SUN TIANQI, ZHANG JINGKAI
• Format: Patent
• Language: Chinese; English
• Published: 25.10.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; PHYSICS

The invention discloses a capacitive fingerprint identification system, electronic equipment and a fingerprint identification method, and the system comprises an integrating circuit which comprises an operational amplifier which is provided with a positive phase input end, a negative phase input end, a grounding end and an output end; the feedback branch is connected between the negative phase input end and the output end; the fingerprint information acquisition circuit is connected with the negative phase input end and is used for inputting reference voltage and a first voltage signal and acquiring fingerprint information; and the floating signal generation circuit is connected with the grounding end, and is used for providing a floating signal adaptive to the working mode for the grounding end based on the second voltage signal and the third voltage signal, and selecting the output floating signal as a first grounding voltage with a constant amplitude or a second grounding voltage with a periodically changi