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    • 57. 发明公开
    • Wide bandwidth attenuator input circuit for a measurement probe
    • BreitbandigeEingangsdämpfungsschaltungfüreine Messprobe
    • EP1605588A2
    • 2005-12-14
    • EP05253338.7
    • 2005-05-31
    • Tektronix Inc.
    • Pollock, Ira G.Hagerup, William A.Chastain, Paul G.Law, William Q.
    • H03H7/24
    • H03H7/24G01R1/06766H03H11/24
    • A wide bandwidth attenuator input circuit for a measurement probe has a Z 0 attenuator circuit coupled in series with a compensated RC attenuator circuit. The series attenuator elements of the Z 0 and the compensated RC attenuator circuits are coupled via a controlled impedance transmission line to the shunt attenuator elements of the Z 0 and the compensated RC attenuator circuits. The shunt element of the Z 0 attenuator element terminates the transmission line in its characteristic impedance. The junction of the series and shunt attenuator elements are coupled to the input of a buffer amplifier. At low and intermediate frequencies, the compensated RC attenuator circuit attenuates an input signal while at high frequencies, the compensated RC attenuator circuit acts as a short and the Z 0 attenuator circuits attenuates the input signal.
    • 用于测量探针的宽带衰减器输入电路(30)具有与补偿的RC衰减器电路串联耦合的Z 0衰减器电路。 Z 0的串联衰减器元件和经补偿的RC衰减器电路通过受控阻抗传输线(32)耦合到Z 0的分流衰减器元件和经补偿的RC衰减器电路。 Z 0衰减器元件的分流元件在其特性阻抗中终止传输线。 串联和分流衰减器元件的结点耦合到缓冲放大器(34)的输入端。 在低频和中频下,补偿的RC衰减器电路在高频时衰减输入信号,补偿的RC衰减器电路作为短路,Z 0衰减器电路衰减输入信号。