Detection circuit and electronic device
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorsLin Feng, Guanjun Zhang
Life of this patent
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Abstract
The present disclosure provides a detection circuit and an electronic device. The detection circuit includes a driving circuit, a cancelling circuit, and a switching circuit. Each driving module of the driving circuit is coupled to a detection capacitor for charging it; each cancelling module of the cancelling circuit is coupled to the detection capacitor to perform capacitance cancellation through two directions; each cancelling module of the cancelling circuit is coupled to the switching module to perform conversion of a capacitive signal and then output. The present disclosure can improve a detection accuracy of the capacitor.
Claims20
A detection circuit, comprising:
- a driving circuit, a cancelling circuit, and a switching circuit;
- the driving circuit comprises at least one driving module;
- each driving module is coupled to at least one detection capacitor and is configured to periodically charge the one detection capacitor;
- the cancelling circuit comprises at least one cancelling module;
- each cancelling module is coupled to the one detection capacitor and is configured to cancel an initial capacitance of the one detection capacitor by charge transfer in two directions;
- and
- the switching circuit comprises at least one switching module;
- the each cancelling module is further coupled to one switching module which is configured to, after the initial capacitance of the one detection capacitor is cancelled, convert a capacitive signal of the one detection capacitor to a voltage signal and output.
An electronic device, comprising:
- a detection circuit;
- the detection circuit comprises:
- a driving circuit, a cancelling circuit, and a switching circuit;
- the driving circuit comprises at least one driving module;
- each driving module is coupled to at least one detection capacitor and is configured to periodically charge the one detection capacitor;
- the cancelling circuit comprises at least one cancelling module;
- each cancelling module is coupled to the one detection capacitor and is configured to cancel an initial capacitance of the one detection capacitor by charge transfer in two directions;
- and
- the switching circuit comprises at least one switching module;
- the each cancelling module is further coupled to one switching module which is configured to, after the initial capacitance of the one detection capacitor is cancelled, convert a capacitive signal of the one detection capacitor to a voltage signal and output.
Dependencies are inferred from the claim text.