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    Operational rectifier and bias generator
    71.
    发明授权
    Operational rectifier and bias generator 失效
    运行整流器和偏置发生器

    公开(公告)号：US4409500A

    公开(公告)日：1983-10-11

    申请号：US247811

    申请日：1981-03-26

    Applicant: David R. Welland

    Inventor： David R. Welland

    IPC: H03F1/30 ,  H02M7/12 ,  H02M7/21 ,  H03D1/18 ,  H03K17/00 ,  G06G7/12

    CPC classification number: H03D1/18

    Abstract: An improved current mode operational rectifier having loop transmissions through both feedback paths of an operational amplifier stage which limit at unity gain. An improved bias generator which can be used to bias the operational rectifier is also disclosed.

    Abstract translation: 改进的电流模式操作整流器具有通过运算放大器级的两个反馈路径的环路传输，其限制了单位增益。 还公开了可用于偏置可操作整流器的改进的偏置发生器。

    Bias generator
    72.
    发明授权
    Bias generator 失效
    偏置发电机

    公开(公告)号：US4329598A

    公开(公告)日：1982-05-11

    申请号：US137427

    申请日：1980-04-04

    Applicant: David R. Welland

    Inventor： David R. Welland

    IPC: H03F1/30 ,  H03F3/347 ,  H03K3/01

    CPC classification number: H03F3/347 ,  H03F1/302

    Abstract: An improved bias generator provides a bias voltage output which varies with temperature in accordance with a predetermined voltage-temperature function.

    Abstract translation: 改进的偏置发生器提供根据预定电压 - 温度函数随温度变化的偏置电压输出。

    CONTROLLER AND METHOD FOR CONTROLLING A CAPACITIVE TOUCH SCREEN OR THE LIKE
    74.
    发明申请
    CONTROLLER AND METHOD FOR CONTROLLING A CAPACITIVE TOUCH SCREEN OR THE LIKE 有权
    用于控制电容触摸屏或类似的控制器和方法

    公开(公告)号：US20130169584A1

    公开(公告)日：2013-07-04

    申请号：US13342673

    申请日：2012-01-03

    Applicant: Vadim Konradi ,  Parker Dorris ,  Michael Franklin ,  David R. Welland

    Inventor： Vadim Konradi ,  Parker Dorris ,  Michael Franklin ,  David R. Welland

    IPC: G06F3/045

    CPC classification number: G06F3/0416 ,  G06F3/044

    Abstract: A controller for a capacitive touch screen includes a touch resolve subsystem and a processor. The touch resolve subsystem, in response to a trigger input, measures a plurality of capacitance values using a plurality of input pins. The processor controls the touch resolve subsystem to acquire a baseline capacitance in a calibration mode, to acquire a frame comprising the plurality of capacitance values in a normal operation mode, and to update the baseline capacitance to a new baseline capacitance in the normal operation mode in response to the frame without entering the calibration mode.

    Abstract translation: 用于电容式触摸屏的控制器包括触摸解析子系统和处理器。 触摸解析子系统响应于触发输入，使用多个输入引脚测量多个电容值。 处理器控制触摸解析子系统以在校准模式中获取基线电容，以在正常操作模式中获取包含多个电容值的帧，并且在正常操作模式中将基线电容更新为新的基线电容 响应帧而不进入校准模式。

    Direct digital access arrangement circuitry and method for connecting to phone lines
    76.
    发明授权
    Direct digital access arrangement circuitry and method for connecting to phone lines 失效

    公开(公告)号：US07283584B2

    公开(公告)日：2007-10-16

    申请号：US10780142

    申请日：2004-02-17

    Applicant: Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    Inventor： Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC: H04B1/38 ,  H04L5/16

    CPC classification number: H04M1/573 ,  H04L7/033 ,  H04L25/0266 ,  H04L25/06 ,  H04M1/76 ,  H04M3/007 ,  H04M11/06 ,  H04M19/001 ,  H04M19/02

    Abstract: An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.

    Digital expander for generating multiple analog control signals particularly useful for controlling an oscillator
    77.
    发明授权
    Digital expander for generating multiple analog control signals particularly useful for controlling an oscillator 有权
    用于产生多个模拟控制信号的数字扩展器，特别适用于控制振荡器

    公开(公告)号：US07262725B2

    公开(公告)日：2007-08-28

    申请号：US11461408

    申请日：2006-07-31

    Applicant: Yunteng Huang ,  Bruno W. Garlepp ,  David R. Welland

    Inventor： Yunteng Huang ,  Bruno W. Garlepp ,  David R. Welland

    IPC: H03M1/00

    CPC classification number: H03L7/093 ,  H03J2200/10 ,  H03L7/099 ,  H03L7/10 ,  H03L2207/06 ,  H03M7/3011 ,  H03M7/3028 ,  H03M7/3037

    Abstract: An exemplary PLL circuit includes a VCO responsive to a plurality of sub-varactor control signals. A digital loop filter for the PLL digitally generates a varactor control word, which is digitally expanded into a plurality of digital values, each of which is conveyed to a corresponding one of a plurality of DACs. A multiplexer is configured to respectively convey the DAC output signals to a group of sub-varactor control signals according to the varactor control word, and to drive remaining sub-varactor control signals to either the full-scale high value or the full-scale low value of the DAC outputs. Each of the DACs preferably includes a hybrid first order/second order sigma-delta modulator, and in certain embodiments, a NRZ-to-RZ coder circuit, and a linear filter circuit.

    Abstract translation: 示例性PLL电路包括响应于多个子变容二极管控制信号的VCO。 用于PLL的数字环路滤波器数字地生成变容二极管控制字，其被数字地扩展成多个数字值，每个数字值被传送到多个DAC中的对应的一个。 复用器被配置为根据变容二极管控制字将DAC输出信号分别传送到一组子变容二极管控制信号，并且将剩余的子变容二极管控制信号驱动到满量程高值或满量程低 DAC输出的值。 每个DAC优选地包括混合一阶/二阶Σ-Δ调制器，并且在某些实施例中，NRZ至RZ编码器电路和线性滤波器电路。

    Direct digital access arrangement circuitry and method for connecting to phone lines
    78.
    发明授权
    Direct digital access arrangement circuitry and method for connecting to phone lines 失效

    公开(公告)号：US07072389B2

    公开(公告)日：2006-07-04

    申请号：US10227104

    申请日：2002-08-23

    Applicant: Jeffrey W. Scott ,  Navdeep S Sooch ,  David R. Welland

    Inventor： Jeffrey W. Scott ,  Navdeep S Sooch ,  David R. Welland

    IPC: H04B1/38 ,  H04L5/16

    CPC classification number: H04M1/573 ,  H04L7/033 ,  H04L25/0266 ,  H04L25/06 ,  H04M1/76 ,  H04M3/007 ,  H04M11/06 ,  H04M19/001 ,  H04M19/02

    Abstract: An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.

    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants
    79.
    发明授权
    Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants 有权
    用于连接到具有可切换时间常数的DC保持电路的电话线的数字接入配置电路和方法

    公开(公告)号：US07046755B2

    公开(公告)日：2006-05-16

    申请号：US10679046

    申请日：2003-10-03

    Applicant: Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    Inventor： Timothy J. Dupuis ,  George Tyson Tuttle ,  Jeffrey W. Scott ,  Navdeep S. Sooch ,  David R. Welland

    IPC: H04L23/00

    CPC classification number: H04L25/06 ,  H04L7/033 ,  H04L25/0266 ,  H04M11/06 ,  H04M19/001

    Abstract: A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.

    Abstract translation: 可以使用数字直接访问布置（DAA）电路来终止在用户端的电话连接，其提供用于到达和来自电话线的信号的通信路径。 简要描述，DAA提供用于各种国际电话标准的DC终端的可编程装置。 本发明还可以用于在电容隔离屏障上传输和接收信号的装置。 更具体地，提供了一种DC可编程直流限流模式可用的直流保持电路。 在限流模式下，功率可能会在DAA集成电路外部的器件中耗散。 此外，大部分功率可能会在外部无源器件（如电阻）中消散。

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