Title:
CAPACITANCE MEASUREMENT APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/179730
Kind Code:
A1
Abstract:
Provided is a capacitance measurement apparatus (200), comprising: a channel capacitor (101) configured to generate different capacitance values according to a sensing signal; a measurement circuit (220) connected to the channel capacitor (101) and configured to access a pulse signal and measure a capacitance value of the channel capacitor (101); and an adjustment circuit (210) connected between the channel capacitor (101) and the measurement circuit (220), and configured to cancel a basic capacitance value of the channel capacitor (101) and generate a varying capacitance value of the channel capacitor (101). The measurement circuit (220) is further configured to convert the varying capacitance value of the channel capacitor (101) into an output signal. A reference capacitance of the channel capacitor (101) is canceled by means of the adjustment circuit (210), thereby increasing the valid range of an output signal of the measurement circuit (220).
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Inventors:
CHEN CHEN (CN)
Application Number:
PCT/CN2020/137360
Publication Date:
September 16, 2021
Filing Date:
December 17, 2020
Export Citation:
Assignee:
CHIPONE TECHNOLOGY BEIJING CO LTD (CN)
International Classes:
G06F3/041; G06F3/044
Foreign References:
| CN110196653A | 2019-09-03 | |||
| CN106598370A | 2017-04-26 | |||
| CN108475155A | 2018-08-31 | |||
| CN111399679A | 2020-07-10 |
Attorney, Agent or Firm:
CHOFN INTELLECTUAL PROPERTY (CN)
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