Patent ID: 11953350
Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 12:
13. The capacitance detection apparatus according to claim 12, wherein the differential detection circuit comprises a first operational amplifier, a first analog-to-digital converter, a first capacitor, and a second capacitor;
a positive input terminal of the first operational amplifier is electrically connected to the first switch, and a negative input terminal of the first operational amplifier is electrically connected to the second switch;
the first capacitor is connected between the positive input terminal of the first operational amplifier and an output terminal of the first operational amplifier, the second capacitor is connected between the negative input terminal of the first operational amplifier and the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is electrically connected to the first analog-to-digital converter.