Evaluation of touch screen display capacitance using a touch screen controller

    公开(公告)号:US10528189B2

    公开(公告)日:2020-01-07

    申请号:US15948147

    申请日:2018-04-09

    Abstract: Disclosed is a method for testing touch screen displays during manufacture. A touch screen controller (TSC) is packaged, and the analog channels of the TSC are characterized, with resulting data being stored for later use. The TSC is programmed, and the touch screen display and TSC are packaged together. The touch screen display is tested using firmware in the TSC, enabling calculation of the inherent capacitances between force and sense lines of the touch screen display when connected to the TSC during operation. The testing involves, for each force and sense line pair, measuring an output signal generated by a receive channel of the TSC coupled to the sense line of that pair. Based upon the data gathered during characterization, and the signals measured during testing, the capacity of the touch screen display is then calculated.

    ANALOG PING DETECTION FOR A WIRELESS CHARGING RECEIVER

    公开(公告)号:US20190334366A1

    公开(公告)日:2019-10-31

    申请号:US15964793

    申请日:2018-04-27

    Abstract: An analog ping signal that is present at a secondary coil of a power receiving device operating within a wireless power transmission system is detected. The detection circuit includes a DC blocking circuit having an input directly connected to a terminal of the secondary coil. A comparator circuit has an input coupled to an output of the DC blocking circuit. A timer circuit is reset by a signal output by the comparator circuit to assert a ping detect signal in response to a resetting of the timer circuit. The ping detect signal is deasserted in response to a timing out of the timer circuit.

    VOLTAGE REGULATOR HAVING BIAS CURRENT BOOSTING

    公开(公告)号:US20180120876A1

    公开(公告)日:2018-05-03

    申请号:US15336029

    申请日:2016-10-27

    Inventor: Sandor PETENYI

    Abstract: A voltage regulator having bias current boosting is provided. The voltage regulator includes a power stage for providing an output voltage to a load. The voltage regulator includes a differential stage that receives a feedback voltage representative of the output voltage and a reference voltage and controls the power stage based on a difference between the reference voltage and the feedback voltage. The voltage regulator includes a bias current boosting stage that receives the feedback and reference voltages. The bias current boosting stage provides a boosted bias current having a current level that is based on the difference between the reference and feedback voltages. The boosted bias current biases the differential stage and hastens a response of the differential stage, in response to a change in the difference between the reference voltage and the feedback voltage, in controlling the power stage.

    Base current compensation for a BJT current mirror

    公开(公告)号:US09864395B1

    公开(公告)日:2018-01-09

    申请号:US15367628

    申请日:2016-12-02

    CPC classification number: G05F3/267

    Abstract: A current mirror circuit includes an input current leg and an output current leg. The input current leg includes: a first bipolar junction transistor (BJT) having a collector terminal configured to receive an input current sourced at a current node and a first metal oxide semiconductor field effect transistor (MOSFET) having a gate terminal coupled to the current node and a source terminal coupled to a base terminal of the first BJT. The output current leg includes: a second BJT having a collector terminal configured to supply an output current and a second MOSFET having a gate terminal coupled to the current node and a source terminal coupled to a base terminal of the second BJT.

    Voltage-to-current sensing circuit and related DC-DC converter
    80.
    发明授权
    Voltage-to-current sensing circuit and related DC-DC converter 有权
    电压 - 电流检测电路和相关的DC-DC转换器

    公开(公告)号:US09035639B2

    公开(公告)日:2015-05-19

    申请号:US13711454

    申请日:2012-12-11

    Inventor: Martin Drinovsky

    CPC classification number: G05F1/46 G05F1/561 H02M3/156 H02M2001/0009

    Abstract: The present disclosure is directed to a voltage-to-current sensing circuit having a bias terminal configured to receive a reference voltage, an offset terminal configured to receive an offset current, and an operational amplifier configured to output a low voltage signal. The device includes a first amplifier having first and second high voltage inputs configured to receive a first voltage difference across a sense component on a high voltage line and to generate a first current, a second amplifier having first and second low voltage inputs configured to receive a second voltage difference between the bias terminal and the offset terminal and to generate a second current, a summing circuit configured to provide an intermediate voltage corresponding to a sum of the first and the second currents, and a low-voltage transistor coupled to an output of the amplifier and controlled by the intermediate voltage to generate the output current.

    Abstract translation: 本公开涉及具有被配置为接收参考电压的偏置端子的电压到电流感测电路,被配置为接收偏移电流的偏移端子和被配置为输出低电压信号的运算放大器。 该器件包括具有第一和第二高电压输入的第一放大器,该第一和第二高电压输入被配置为接收高电压线上的感测元件上的第一电压差并产生第一电流,第二放大器具有第一和第二低电压输入, 偏置端子和偏移端子之间的第二电压差并产生第二电流,求和电路被配置为提供对应于第一和第二电流的和的中间电压,以及耦合到第一和第二电流的输出的低压晶体管 该放大器由中间电压控制,以产生输出电流。

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