Electronics > Beginners

Anyone knows if FET gm tracks Id over temperature?

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T3sl4co1l:
A correction, that's at V_DS = 50V so it should be well above the triode region.

It doesn't look like the slopes ever match, along any given horizontal pair of points; they approach each other at very high currents, but that may be as much visual (semilog plot) as due to gm simply running out of steam at high currents.

So it would seem a one-to-one function should solve it, i.e., I_D decreasing with T, at whatever exact rate happens to fit (exp(-T^1.5)??).

Which also means, the maximum power point, or distortion-free class A dynamic range (or anything related, like IP3), will vary, so keep that in mind as far as guard-banding the design.

Tim

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