公开(公告)号：US20150115977A1

公开(公告)日：2015-04-30

申请号：US14067863

申请日：2013-10-30

Applicant: SYNAPTICS INCORPORATED

Inventor： Eric Scott BOHANNON ,  Marshall J. BELL, JR. ,  Kirk HARGREAVES ,  Murat OZBAS ,  Jeffrey A. SMALL

IPC: G01R27/26 ,  G06F3/044 ,  G01R35/00

CPC classification number: G01R27/2605 ,  G01R35/005 ,  G06F3/044

Abstract: The embodiments herein are generally directed to using a current-mode CBC circuit to maintain a voltage bias setting at a receiver when performing capacitive sensing. To do so, the CBC circuit may compensate for the change in voltage at a receiver by providing a current at the input of the receiver. Instead of using a passive CBC capacitor for each receiver, the input device may use a single CBC capacitor and a plurality of current mirrors to source and sink the current required to correct the input voltage at a plurality of receivers. As a result, the current-mode CBC circuit includes only one passive capacitor (or bank of capacitors) and a plurality of current mirrors which may provide space and cost benefits relative to a CBC circuit that uses a passive capacitor (or bank of capacitors) for each receiver channel.

Abstract translation: 本文的实施例通常涉及使用电流模式CBC电路来在执行电容感测时维持接收器处的电压偏置设置。 为此，CBC电路可以通过在接收机的输入端提供电流来补偿接收机的电压变化。 代替对每个接收机使用无源CBC电容器，输入装置可以使用单个CBC电容器和多个电流镜来源和吸收在多个接收器处校正输入电压所需的电流。 结果，电流模式CBC电路仅包括一个无源电容器（或电容器组）和多个电流镜，其可以相对于使用无源电容器（或电容器组）的CBC电路提供空间和成本优势， 对于每个接收器通道。

公开(公告)号：US20170090615A1

公开(公告)日：2017-03-30

申请号：US14871432

申请日：2015-09-30

Applicant: SYNAPTICS INCORPORATED

Inventor： Eric Scott BOHANNON ,  Petr SHEPELEV ,  Jeffrey S. LILLIE ,  Thomas MACKIN

IPC: G06F3/044

CPC classification number: G06F3/044 ,  G06F3/0412 ,  G06F3/0418 ,  G06F2203/04107 ,  G09G3/3655 ,  G09G3/3677 ,  G09G3/3688 ,  G09G2320/0219 ,  G09G2330/021 ,  G09G2354/00

Abstract: Embodiments described herein include an input device, processing system, and method of performing capacitive sensing using an input device comprising a first plurality of sensor electrodes, a second plurality of sensor electrodes, and a plurality of display electrodes. The method comprises, during a first period, driving the first plurality of sensor electrodes with a first absolute capacitive sensing signal to receive first resulting signals, and driving the second plurality of sensor electrodes and the plurality of display electrodes with a first guarding signal. Each of the first plurality of sensor electrodes comprises at least one common electrode of a display, and wherein each common electrode is configured to be driven for display updating and for capacitive sensing.

公开(公告)号：US20170090610A1

公开(公告)日：2017-03-30

申请号：US14868804

申请日：2015-09-29

Applicant: SYNAPTICS INCORPORATED

Inventor： Petr SHEPELEV ,  Eric Scott BOHANNON ,  Kasra KHAZENI

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/03547 ,  G06F3/0416 ,  G06F3/0418 ,  G06F11/00 ,  G06F11/002 ,  G06F11/004 ,  G06F11/006 ,  G06F11/008 ,  G06F11/142 ,  G06F11/1423 ,  G06F11/1428 ,  G06F2201/81 ,  G06F2203/04101

Abstract: This disclosure generally provides an input device that includes a matrix sensor that includes a plurality of sensor electrodes arranged in rows on a common surface or plane. The input device may include a plurality of sensor modules coupled to the sensor electrodes that measure capacitive sensing signals corresponding to the electrodes. Instead of measuring sensor electrodes that are in the same column, the embodiments herein simultaneously measure capacitive sensing signals on at least two sensor electrodes that are in the same row. In one example, the sensor electrodes in the row being measured are spaced the same distance from a side of a substrate coupling the electrodes to the sensor modules and may have approximately the same electrical time constant.

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。

公开(公告)号：US20140375384A1

公开(公告)日：2014-12-25

申请号：US13922187

申请日：2013-06-19

Applicant: Synaptics Incorporated

Inventor： Eric Scott BOHANNON ,  Marshall J. BELL

IPC: H03F3/217

CPC classification number: H03F3/2171 ,  H03F3/45183

Abstract: Embodiments of the invention are generally directed to improving the slew rate of an amplifier as the amplifier charges or discharges a capacitive load. In one embodiment, the amplifier is coupled to a slew-enhancing circuit which uses a control signal from the amplifier to aid the amplifier when charging or discharging the load. For example, the control signal may be an internal voltage used by the amplifier to control circuit elements within the amplifier. By routing the control signal to the slew-enhancing circuit, the control signal biases the circuit elements within the slew-enhancing circuit to source a boost current when charging the capacitive load or sink the boost current when discharging the capacitive load.

Abstract translation: 本发明的实施例一般涉及随着放大器对容性负载进行充电或放电而提高放大器的转换速率。 在一个实施例中，放大器耦合到转换增强电路，其使用来自放大器的控制信号来在对负载充电或放电时辅助放大器。 例如，控制信号可以是放大器用于控制放大器内的电路元件的内部电压。 通过将控制信号路由到转换增强电路，当对容性负载进行充电时，控制信号偏置摆幅增强电路内的电路元件，以便在对容性负载进行放电时吸收升压电流，或者在放电容性负载时吸收升压电流。