Another great video from Asianometry.
My only quibble is that it kind of left unclear the differences between JFETs and MOSFETs. After all, we still use both. Note our beloved J310 JFET. And the IRF510 is a MOSFET.
Google's AI explains:
A JFET (Junction Field-Effect Transistor) and a MOSFET (Metal Oxide Semiconductor Field-Effect Transistor) are both types of field-effect transistors, but the key difference is that in a JFET, the channel conductivity is controlled by a reverse-biased PN junction, while in a MOSFET, it's controlled by an electric field across an insulating layer between the gate and the channel, allowing for a much higher input impedance and greater design flexibility in MOSFETs; essentially, MOSFETs are considered a more advanced version of JFETs with superior performance in many applications like high-speed switching and integration into complex circuits.
Well, the mechanisms have much more in common than Google AI would lead one to believe. Both JFET and MOSFET work by creating a channel dimensions governed by the gate voltage-- not so much the channel conductivity or resistivity. That would imply that the bulk resistivity is being modified by the gate. That is the way BJT, PIN's and other devices function.
ReplyDeleteThe difference is in the way JFET's and MOSFET's implement channel depletion (or enhancement for certain MOSFET's).
73!
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