Electronics > Beginners

Transistor rise fall time & frequency response

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Benta:

--- Quote from: fonograph on July 21, 2018, 09:59:57 pm ---
--- Quote from: Benta on July 21, 2018, 03:27:41 pm ---If the transistor is operated as a saturated switch, it's a completely different story, and  fT will not tell you anything at all.

--- End quote ---

Why?

--- End quote ---

Because in saturation there is a surplus of charge in the base region of the transistor. When switching off the device, this charge needs to be evacuated before the transistor starts turning off. So the possible switching frequency in saturation is much lower than fT.

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