Title:
DETECTION CIRCUIT, CHIP, AND RELATED ELECTRONIC APPARATUS
Document Type and Number:
WIPO Patent Application WO/2022/155874
Kind Code:
A1
Abstract:
A detection circuit (100, 200), a chip, and a related electronic apparatus, wherein the detection circuit (100, 200) comprises: a first input end (P1), a second input end (P2), an input end (NSA1) of a differential integral circuit (110, 210), an energy storage member (A1), first to sixth switching circuits (SW1-SW6), and the differential integral circuit (110, 210). The detection circuit (100, 200) generates a detection voltage signal (VOUT) according to a sensed capacitance value between the first input end (P1) and the second input end (P2). The first switching circuit (SW1) is coupled to the first input end (P1), the input end (NSA1) of the differential integral circuit (110, 210), and the ground (GND). The second switching circuit (SW2) is coupled to the second input end (P2), the input end (NSA1) of the differential integral circuit (110, 210), and the ground (GND). The third switching circuit (SW3) is coupled to the input end (NSA1) of the differential integral circuit (110, 210), and an operating voltage (VDD). The fourth switching circuit (SW4) is coupled to the energy storage member (A1) and the ground (GND). The fifth switching circuit (SW5) is coupled to the energy storage member (A1), the ground (GND) and the operating voltage (VDD). The sixth switching circuit (SW6) is coupled to a first end of the energy storage member (A1) and the input end (NSA1) of the differential integral circuit (110, 210). The differential integral circuit (110, 210) is configured to perform integration according to the voltage at the input end (NSA1) of the differential integral circuit (110, 210) so as to generate the detection voltage signal (VOUT).
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Inventors:
YU QIAN (CN)
Application Number:
PCT/CN2021/073195
Publication Date:
July 28, 2022
Filing Date:
January 22, 2021
Export Citation:
Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
G01N27/22; G01R27/26
Foreign References:
| CN103475352A | 2013-12-25 | |||
| CN211348433U | 2020-08-25 | |||
| CN103597330A | 2014-02-19 | |||
| CN111707295A | 2020-09-25 | |||
| CN107949824A | 2018-04-20 | |||
| US20200012365A1 | 2020-01-09 |
Attorney, Agent or Firm:
TIANTAI LAW FIRM (CN)
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