公开(公告)号：US20170075495A1

公开(公告)日：2017-03-16

申请号：US15265465

申请日：2016-09-14

Applicant: SYNAPTICS INCORPORATED

Inventor： Jeremy ROBERSON ,  David SOBEL ,  Farzaneh SHAHROKHI ,  Adam SCHWARTZ ,  Don SPECK ,  Eric Scott BOHANNON

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/044 ,  G06F2203/04108

Abstract: Embodiments described herein include an input device with a plurality of capacitive sensor electrodes configured to receive a signal. The input device also includes a processing system coupled to the plurality of capacitive sensor electrodes. The processing system includes an analog front end (AFE). The AFE includes an anti-aliasing filter comprising a continuous time analog infinite impulse response (IIR) filter configured to filter out interference from the received signal at frequencies higher than a signal frequency of the processing system to produce an anti-aliased signal. The AFE also includes a charge integrator configured to integrate the anti-aliased signal.

Abstract translation: 本文描述的实施例包括具有被配置为接收信号的多个电容传感器电极的输入装置。 输入装置还包括耦合到多个电容传感器电极的处理系统。 处理系统包括模拟前端（AFE）。 AFE包括抗混叠滤波器，其包括连续时间模拟无限脉冲响应（IIR）滤波器，其被配置为以高于处理系统的信号频率的频率滤除来自接收信号的干扰，以产生抗混叠信号。 AFE还包括电荷积分器，其被配置为集成抗混叠信号。