Resistors being where they shouldn't be - h-parameters

Thread Starter

KevinEamon

Joined Apr 9, 2017
261
Guys see that resistor there where I have the red pen. Should that be there in this model?

I'm trying to think - maybe it's some type of double source transformation or something.
I'm thinking that Vi is across that hie + whatever else is to the right of it.

So what's with the VT and the RT? Why go to the trouble?

1573079924299.png
 

The Electrician

Joined Oct 9, 2007
2,750
Vt and Rt are simply the Thevenin equivaent of the signal source driving the transistor. This way the effect of a non-ideal source can be dealt with. If Rt is not there then the driving source would be an ideal voltage source (zero impedance).
 

Thread Starter

KevinEamon

Joined Apr 9, 2017
261
Yeh I was thinking that myself Electrician. He's setting us up for other types of models then. KK it just wrecked my brain last night. Thanks for the confirmation
 
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