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    • 4. 发明授权
    • Apparatus and method for expanding the frequency range over which
electrical signal amplitudes can be accurately measured
    • 用于扩展频率范围的装置和方法,可以精确地测量电信号幅度
    • US4978907A
    • 1990-12-18
    • US349724
    • 1989-05-10
    • Douglas C. Smith
    • Douglas C. Smith
    • G01R1/067
    • G01R1/06772
    • It has been found that the ground lead of a measurement instrument probe has an inductance which, when coupled with the capacitance of the rest of the probe, forms a resonant circuit. The net result is a peak in the frequency response of the probe which interferes with accurate amplitude measurements of test signals having a frequency above some threshold. Pursuant to the present invention, a resistor is added to the measurement instrument probe whose value substantially flattens the frequency response of the probe and permits accurate amplitude measurements over a substantially greater frequency range. This resistor, either having a fixed or adjustable value, can be added to the measurement instrument probe or can be included in an adjunct which fits over a probe end.
    • 已经发现,测量仪器探针的接地引线具有当与探针的其余部分的电容耦合时形成谐振电路的电感。 最终结果是探针的频率响应中的峰值,其干扰具有高于某个阈值的频率的测试信号的精确幅度测量。 根据本发明,在测量仪器探针中加入一个电阻,其值基本上平坦于探针的频率响应,并允许在更大的频率范围内进行精确的振幅测量。 该电阻器具有固定值或可调节值,可以添加到测量仪器探头中,或者可以包含在适合探头端的辅助器中。
    • 10. 发明授权
    • Communication line transient protection
    • 通讯线路瞬态保护
    • US4751607A
    • 1988-06-14
    • US895224
    • 1986-08-11
    • Douglas C. Smith
    • Douglas C. Smith
    • H04B3/00H04B3/28H04M19/00H02H9/08
    • H04B3/28
    • The severity of the problems of transmitting high speed data over a regular twisted wire pair are legendary. These problems arise from a variety of conditions, including the capacitance of the wire (which increases with length) and the propensity of unshielded wire to pickup high induced voltages. An arrangement is disclosed that is suitable for short, as well as long, wire distances and which also effectively eliminates the interference problem caused by induced voltages, including those causes by electrostatic discharge. This arrangement passes two twisted wire pairs through a series of ferrite cores. The twisted wire pairs coming out of the ferrite cores are terminated such that one of the pairs is connected to ground while the signal carrying twisted pair is connected to a small signal balun coil, pulse shaping circuit and low pass filter.
    • 通过普通双绞线传输高速数据的问题的严重性是传奇。 这些问题出现在各种条件下,包括导线的电容(随着长度的增加而增加)和非屏蔽导线拾取高感应电压的倾向。 公开了一种适用于短距离和长距离线路的布置,并且还有效地消除了由感应电压引起的干扰问题,包括那些由静电放电引起的电压。 这种安排通过一系列铁氧体磁芯的两条双绞线对。 从铁氧体磁芯出来的绞合线对终止,使得一对配对连接到地,而信号承载双绞线连接到小信号平衡 - 不平衡转换线圈,脉冲整形电路和低通滤波器。