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    Digital-to-analog converter with power up/down transient suppression and automatic rate switching
    5.
    发明授权
    Digital-to-analog converter with power up/down transient suppression and automatic rate switching 有权
    具有上电/下拉瞬变抑制和自动速率切换功能的数模转换器

    公开(公告)号：US06522278B1

    公开(公告)日：2003-02-18

    申请号：US10078824

    申请日：2002-02-19

    申请人： Jason P. Rhode ,  Johann G. Gaboriau ,  Xiaofan Fei

    发明人： Jason P. Rhode ,  Johann G. Gaboriau ,  Xiaofan Fei

    IPC分类号： H03M166

    CPC分类号： H03M1/0881 ,  H03M1/822

    摘要： Power-up and power-down transient suppression are provided for an audio digital-to-analog converter with a single ended output to prevent annoying pops which accompany switching an audio system on and off. Power-up suppression is achieved by driving the output of a pulse-width circuit to a reference level such as around, and driving the pulse-width circuit gradually to its quiescent (zero signal) value. Power-down suppression is provided by using a positive feedback amplifier to accelerate current drain initiated by a constant current source used to bleed off the charge on output capacitor. The techniques disclosed apply readily to the outputs received from CDs, CD-ROMs, DAT and other digital recording media.

    摘要翻译： 为具有单端输出的音频数/模转换器提供上电和掉电瞬态抑制，以防止伴随音频系统开启和关闭的烦人的弹出。 通过将脉冲宽度电路的输出驱动到诸如周围的参考电平并且逐渐将脉冲宽度电路驱动到其静态（零信号）值来实现上电抑制。 通过使用正反馈放大器来加速由用于消除输出电容器上的电荷的恒定电流源引发的电流消耗来提供掉电抑制。 所公开的技术容易地应用于从CD，CD-ROM，DAT和其他数字记录介质接收的输出。

    Automatic mode detection circuits for configuring a terminal as an output terminal in a first mode as an input terminal in a second mode
    7.
    发明授权
    Automatic mode detection circuits for configuring a terminal as an output terminal in a first mode as an input terminal in a second mode 有权
    自动模式检测电路，用于在第一模式中将端子配置为输出端作为第二模式中的输入端

    公开(公告)号：US07055045B1

    公开(公告)日：2006-05-30

    申请号：US10329853

    申请日：2002-12-26

    申请人： Johann G. Gaboriau ,  Xiaofan Fei

    发明人： Johann G. Gaboriau ,  Xiaofan Fei

    IPC分类号： G06F1/30 ,  H01L25/00 ,  G01R31/28

    CPC分类号： G06F1/04

    摘要： Mode detection circuitry includes first detection circuitry which detects the presence of a first input signal selectively presented at a first terminal for a first selected time duration and, in response, selectively generating a first control signal indicative of a first mode. Second detection circuitry detects the presence of a second input signal selectively presented at a second terminal for a second selected time duration and, in response, selectively generating a second control signal indicative of a second mode. Control circuitry configures the second terminal as an output terminal in the first mode and as an input terminal in the second mode in response to the first and second control signals.

    摘要翻译： 模式检测电路包括第一检测电路，其检测在第一选定持续时间内选择性地呈现在第一终端处的第一输入信号的存在，并且作为响应，选择性地产生指示第一模式的第一控制信号。 第二检测电路检测在第二选择的持续时间内选择性地呈现在第二终端的第二输入信号的存在，并且作为响应，选择性地产生指示第二模式的第二控制信号。 响应于第一和第二控制信号，控制电路将第二端子配置为第一模式中的输出端子和第二模式中的输入端子。