公开(公告)号：US08890841B2

公开(公告)日：2014-11-18

申请号：US13798736

申请日：2013-03-13

Applicant: 3M Innovative Properties Company

Inventor： Thomas J. Rebeschi ,  Craig A. Cordeiro ,  William Farlow

IPC: G06F3/045 ,  G06F3/044

CPC classification number: G06F3/044 ,  G06F3/0418 ,  H03K17/9622 ,  H03K2217/960705

Abstract: A touch-sensitive device that includes a touch surface circuit that facilitates a change in a coupling capacitance in response to a capacitance-altering touches occurring at the touch surface. The device includes a sense circuit that provides a signal, in response thereto, having transient portions for characterizing positive-going transitions towards an upper signal level and negative-going transitions towards a lower signal level. An amplification circuit is then used for amplifying and processing the signals, in response to the time-varying input parameters. The amplification circuit adjusts the gain for the transient portions relative to gain for portions of the response signals between the transient portions, and thereby suppresses RF interference, such as in the form of signal odd and/or even harmonics, to provide a noise filtered output for determining positions of capacitance-altering touches on the touch surface.

Abstract translation: 一种触敏装置，其包括触摸表面电路，其响应于在触摸表面处发生的电容变化的触摸而促进耦合电容的变化。 该装置包括感测电路，其响应于此提供具有用于表征向上信号电平的正向转变的瞬态部分的信号，并且朝向较低信号电平的负向转变。 然后根据时变输入参数，使用放大电路来放大和处理信号。 放大电路相对于瞬态部分之间的响应信号的部分相对于增益调整瞬态部分的增益，从而抑制RF干扰，例如以信号奇和/或偶次谐波的形式提供噪声滤波输出 用于确定触摸表面上的电容改变触摸的位置。

公开(公告)号：US20140267129A1

公开(公告)日：2014-09-18

申请号：US13798736

申请日：2013-03-13

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Thomas J. Rebeschi ,  Craig A. Cordeiro ,  William Farlow

IPC: G06F3/044

CPC classification number: G06F3/044 ,  G06F3/0418 ,  H03K17/9622 ,  H03K2217/960705

Abstract: A touch-sensitive device that includes a touch surface circuit that facilitates a change in a coupling capacitance in response to a capacitance-altering touches occurring at the touch surface. The device includes a sense circuit that provides a signal, in response thereto, having transient portions for characterizing positive-going transitions towards an upper signal level and negative-going transitions towards a lower signal level. An amplification circuit is then used for amplifying and processing the signals, in response to the time-varying input parameters. The amplification circuit adjusts the gain for the transient portions relative to gain for portions of the response signals between the transient portions, and thereby suppresses RF interference, such as in the form of signal odd and/or even harmonics, to provide a noise filtered output for determining positions of capacitance-altering touches on the touch surface.

Abstract translation: 一种触敏装置，其包括触摸表面电路，其响应于在触摸表面处发生的电容变化的触摸而促进耦合电容的变化。 该装置包括感测电路，其响应于此提供具有用于表征向上信号电平的正向转变的瞬态部分的信号，并且朝向较低信号电平的负向转变。 然后根据时变输入参数，使用放大电路来放大和处理信号。 放大电路相对于瞬态部分之间的响应信号的部分相对于增益调整瞬态部分的增益，从而抑制RF干扰，例如以信号奇和/或偶次谐波的形式提供噪声滤波输出 用于确定触摸表面上的电容改变触摸的位置。