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。

公开(公告)号：US20190361545A1

公开(公告)日：2019-11-28

申请号：US16533474

申请日：2019-08-06

Applicant: SYNAPTICS INCORPORATED

Inventor： Eric Scott BOHANNON ,  Marshall J. BELL, JR.

IPC: G06F3/044 ,  G06F3/041

Abstract: A method and related processing system and input device are disclosed, the method comprising driving a first capacitive sensing signal with first sensing frequency onto a first group of a plurality of sensor electrodes, and acquiring first capacitive measurements of resulting signals received by a second group of the plurality of sensor electrodes. Acquiring first capacitive measurements comprises applying a first demodulation signal with a predefined first mixing period defined within a sensing period associated with the first sensing frequency. The method further comprises driving a second capacitive sensing signal having a second sensing frequency different than the first sensing frequency onto a third group of the plurality of sensor electrodes, and acquiring second capacitive measurements of resulting signals received by a fourth group of the plurality of sensor electrodes. Acquiring second capacitive measurements comprises applying a second demodulation signal having a different predefined second mixing period.

公开(公告)号：US20190095002A1

公开(公告)日：2019-03-28

申请号：US16036018

申请日：2018-07-16

Applicant: Synaptics Incorporated

Inventor： Eric Scott BOHANNON ,  Steve Chikin LO ,  Petr SHEPELEV

IPC: G06F3/044 ,  H03K17/96 ,  G06F3/041

Abstract: An input device includes a plurality of sensor electrodes and a processing system that is operable in at least a first mode or a second mode. The processing system is configured to receive an input current from a pair of the sensor electrodes. When operating the first mode, the processing system is configured to measure a capacitance across the pair of sensor electrodes based on the received input current. When operating the second mode, the processing system is configured to measure a resistance between the pair of sensor electrodes based on the received input current.

公开(公告)号：US20180356914A1

公开(公告)日：2018-12-13

申请号：US16107570

申请日：2018-08-21

Applicant: SYNAPTICS INCORPORATED

Inventor： Eric Scott BOHANNON ,  Marshall J. BELL, JR. ,  Yihong YANG

IPC: G06F3/041 ,  G06F3/044 ,  G06F3/0354

Abstract: A processing system, and associated input device and method are disclosed suitable for reducing a receiver size within the input device. The processing system comprises a delta-sigma modulator comprising one or more input nodes configured to receive a signal based on a sensor signal received from at least a first sensor electrode of the plurality of sensor electrodes. The delta-sigma modulator further comprises an integrator coupled with the one or more input nodes and configured to produce an integration signal, a quantizer coupled with an output of the integrator and configured to quantize the integration signal, and a feedback digital-to-analog converter (DAC) controlled based by the quantizer. The processing system further comprises a digital filter coupled with an output of the delta-sigma modulator and configured to mitigate a quantization noise of the quantizer.

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。