MOSFET equivalent rsistance

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?

Thanks.

Reply to
Lauren.Kehoe
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Simulate it ?:-)

...Jim Thompson

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|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
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Reply to
Jim Thompson

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.

daceo

Reply to
daceo

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).

Reply to
Robert Baer

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