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MOSFET equivalent rsistance

Discussion in 'Electronic Design' started by [email protected], Mar 12, 2007.

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  1. Guest

    I'm designing a photon counting circuit using PSpice and I'm replacing
    a 100k resistor with a mosfet but first need to get the equivalent
    resistance of the mosfet. Can anybody tell me how to do this?

  2. Jim Thompson

    Jim Thompson Guest

    Simulate it ?:)

    ...Jim Thompson
  3. daceo

    daceo Guest

    If you are trying to use it as a current source, the thread "is a
    mosfet really a good current source" may be interesting, (but
    strangely truncated now???) It is quite good to make up /use a curve
    tracer and then measure the dV and dI. Some mosfets are better than
    others, avoid ST! the parameter lambda is used to determine the drain
    impedance with respect to current, but the models in switcher cad all
    seemed better than real devices in this respect to me.

  4. Robert Baer

    Robert Baer Guest

    You say nothing about biasing of the FET, source current, regular
    power FET, logic FET, etc & etc.
    So the answer is: the resistance can be anything from about 30
    milliohms to kmegohms (or more).
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