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    parasitic impedance

    Does anyone have any idea about the value of the parasitic impedance and parasitic capacitance of a 0 ohm resistor in 1206, 0805 and 0603 smd package?

    •   Alt4th March 2004, 14:15

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    Re: parasitic impedance and capacitance

    hi,


    You can measure S-parameters of the 0R resistor using network analyzer and model it yourself by using the measurement

    eecly



    •   Alt4th March 2004, 16:07

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    Re: parasitic impedance and capacitance

    eecly, thank you. I know how I can measure it, but I do not have such equipment. My question was if somebody knows approx. values from experience/previous measurements.



    •   Alt4th March 2004, 16:49

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    Re: parasitic impedance and capacitance

    As a rule of thumb u can use the following model (I use this usually)

    * Cp
    * ,--------||-----------.
    * | |
    * | |
    * | |
    * | |
    * | |
    * o---o---L__|----((((------o----o
    * | R L |
    * | --
    * Cs-- -- Cs
    * -- |
    * | |
    * '--------GND----------'
    typical values:
    Cs 0.03-0.1 pF
    Cp 0.05-0.2 pF
    L 0.4-0.8 nH

    rgds, Al

    Sorry, the drawing doesn't look as I expected. At both pads Cs to ground, between pads series R-L, Cp in paralel to the pads



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