MOSFET equivalent rsistance

Simulate it ?:-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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

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).