Discussion in 'General Electronics Chat' started by engradnan, May 31, 2014.
How to calculate the trans-conduction efficiency of a MOSFET?
Strangely worded question. Trans-conduction: a change of current that flows as a result of changes in the driving voltage (Vgs). Rate of trans-conduction: the amount of change of current corresponding to the amount of change of voltage, as in dI/dV
These two terms are different from each other so I am having difficulty defining the efficiency. What if the change in current is 1 ma per volt? You can call that, "one millimho". What if the change in current is 100 amps per volt? That would be 100 mhos.
100 mhos out of what? Efficiency is a percentage of something per something. I can't see a fixed something to compare one amount of mhos to another. Mosfet B might be 100,000 times as efficient as mosfet A, but you must have a point of reference to make an efficiency number.