公开(公告)号：US20140145734A1

公开(公告)日：2014-05-29

申请号：US13796024

申请日：2013-03-12

Applicant: SITRONIX TECHNOLOGY CORP.

Inventor： Meng Yong LIN ,  Ming-Huang LIU ,  Wei Yang OU

IPC: G01R27/26

CPC classification number: G01R27/2605 ,  G01D5/24

Abstract: The present invention provides a capacitor sensing circuit, comprising a driving unit, a switching unit, a differential integrator circuit, and a post-processing circuit. The driving unit is for providing driving signals and timing required by the capacitor sensing circuit, the switching unit switches signals according to two inverting timings, φ1 and φ2, the driving unit drives the capacitor sensing circuit, and together with the positive/negative input terminals of the differential integrator circuit, the signals are accumulated and integrated in both timing φ1 and φ2. The post-processing circuit receive the differential output of the differential integrator circuit for processing and/or utilizing the signals. The two timing signals are time-sharing signals in a period. Therefore, the capacitor sensing circuit is not effected by the common mode noise, and the accuracy and the sensibility are increased.

Abstract translation: 本发明提供了一种电容器感测电路，包括驱动单元，开关单元，差分积分电路和后处理电路。 驱动单元用于提供电容器感应电路所需的驱动信号和时序，开关单元根据两个反相定时＆1和2驱动信号，驱动单元驱动电容感应电路，并与正极 /差分积分电路的负输入端子，信号在时序＆1和＆phgr。2中累积和积分。 后处理电路接收用于处理和/或利用该信号的差分积分电路的差分输出。 两个定时信号是一段时间内的分时信号。 因此，电容感测电路不受共模噪声的影响，精度和灵敏度也提高。