Capacitive sensing circuit

By introducing a sampling and holding circuit and a signal generation circuit into the capacitance sensing circuit, the noise of the input signal is fixed, and the problem of low signal-to-noise ratio under the influence of noise in the prior art is solved, and the accuracy of capacitance sensing is improved.

CN113448458BActive Publication Date: 2025-01-07SENSORTEK TECH
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Patent Information

Application Number
CN202110321198.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-03-25
Filing Date
2021-03-25
Publication Date
2025-01-07
Estimated Expiration
2041-03-25

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Abstract

The present invention relates to a capacitance sensing circuit, which samples and holds a reference signal to generate an input reference signal, thereby generating an input signal to a sensing circuit, so that the sensing circuit generates an output signal for capacitance sensing according to the input signal and a sensing signal.
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