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1. (WO2018126459) CAPACITANCE MEASUREMENT CIRCUIT AND ELECTRONIC DEVICE

Pub. No.:    WO/2018/126459    International Application No.:    PCT/CN2017/070492
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Sat Jan 07 00:59:59 CET 2017
IPC: G06F 3/041
Applicants: SHENZHEN HUIDING TECHNOLOGY CO.,LTD.
深圳市汇顶科技股份有限公司
Inventors: CHEN, Sheng-Kai
陈圣凯
WEN, Ya-Nan
文亚南
YANG, Fu-Chiang
杨富强
Title: CAPACITANCE MEASUREMENT CIRCUIT AND ELECTRONIC DEVICE
Abstract:
A capacitance measurement circuit (12), comprising: a driving circuit (120) coupled to multiple transmitting electrodes (TX_1-TX_N) and used for generating a driving signal (tx1-txN) for the multiple transmitting electrodes (TX_1-TX_N); an impedance unit (122) coupled to the driving circuit (120) and used for receiving the driving signal (tx1-txN) and for generating multiple virtual electrode signals (rx1'-rxM'), multiple internal impedances (Z_ij_in) being formed in the impedance unit (122), the multiple virtual electrode signals (rx1'-rxM') being associated with the multiple internal impedances (Z_ij_in); and multiple first amplifiers (Amp_pre_1-Amp_pre_M) coupled to multiple receiving electrodes (RX_1~RX_M) and the impedance unit (122), multiple first output signals (Vo_pre_1-Vo_pre_M) outputted by the multiple first amplifiers (Amp_pre_1-Amp_pre_M) being associated with the magnitudes of multiple capacitances (Cij) between the multiple transmitting electrodes (TX_1-TX_N) and the multiple receiving electrodes (RX_1-RX_M).