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threshold voltage drop ?

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juglers

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please help me with-

what is meant by threshold voltage drop ?
when does it occur in current mode circuits?

thank you
 

Let me guess:

You're talking about a simple analoug schmitt-trigger? The input impedance on most variants will slightly change when threshold level is reached and output voltage shift to oposite level.
So the voltage source applied have high output impedance, voltage on schmitt-trigger input will jump a little in either direction at level shift.

Uploaded image is a typical simple analog schmottrigger.
28_1289163825.gif
70_1289163825.png
 

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