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Small signal model of emitter follower circuit

Phillolol

Dec 21, 2021
3
Joined
Dec 21, 2021
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Hello!

I have been given the following task:

" Implement the emitter follower (efollower.ms14) with load resistors 100, 200, 500, 1 kΩ load resistance, and establish the gain for each case. (It should not vary very significantly). From this, deduce the output impedance. Hint, consider the output voltage and current as a Thévenin (or Norton) source, and use the gradient to find the Thévenin or (Norton) resistor. "

Here is the circuit:
unknown.png


Where exactly do the load resistors go?
Do I need to find the Thevenin/Norton equivalent?
If so, how would I go about doing that?

Thank you very much in advance!
 

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Phillolol

Dec 21, 2021
3
Joined
Dec 21, 2021
Messages
3
So if the output voltage and current are the source then RE is Rn?

Sorry, i am so confused with this task, i have been trying to look for information for 2 days and came here as a last resort.
 
Last edited:

Harald Kapp

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Nov 17, 2011
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What is Rn supposed to be?
What you need to do is find a representation of the emitter follower as voltage or current source, then attach a load resistor. See e.g. this discussion.
 
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