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    Cable simulator with lumped components

    I need to design a lumped component based cable simulator. This is to save cost for buying long cable. Does anybody have idea how to realize it?

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    Re: Cable simulator with lumped components

    In general it's no possible (simulate all cable properties with a finite number of components).

    It may be possible for restricted bandwidth, limited accuracy etc. What's your specification? Which application?


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    Re: Cable simulator with lumped components

    Quote Originally Posted by FvM View Post
    In general it's no possible (simulate all cable properties with a finite number of components).

    It may be possible for restricted bandwidth, limited accuracy etc. What's your specification? Which application?
    Thanks for the help. I need to simulate Belden 1694A up to 600 meters. The error should be within +/-1 dB up to 6GHz. Do you have any recommended document about this topic?



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    Re: Cable simulator with lumped components

    You can possibly simulate the attenuation characteristic, but not the delay and respectively not the reflections. Also crosstalk and common mode characteristic are effectively out of reach.

    Depending on the test purpose, it's better to use a real cable.



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    Re: Cable simulator with lumped components

    Quote Originally Posted by cariban View Post
    Thanks for the help. I need to simulate Belden 1694A up to 600 meters. The error should be within +/-1 dB up to 6GHz.
    For these specs, doing it with the actual real cable is by far the cheapest solution.


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    Re: Cable simulator with lumped components

    O.K. Belden 1694A is a single core coax, so no problem with crosstalk or common mode.



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    Re: Cable simulator with lumped components

    Thanks a lot to both FvM and volker@muehlhaus. You two are right, it is difficult to make a simulator matching to real cable with amplitude, phase and returnloss in the same time.
    I have manage to make a simulator up to 3GHz for 100m Belden 1694A with 10 realistic components. Refer to the attached pictures for simulated performance.

    The purpose of making the simulator is to do automatic production testing of SDI transceivers. Real cable roll will be
    too big and heavy. I have constructed the 100m/3GHz simulator on testing board. The attenuation curve matches well with the simulation and we can use it for the testing

    Click image for larger version. 

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