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A year ago I took an Electronics course using https://www.amazon.com/Electronic-D...sr_1_1?ie=UTF8&s=books&qid=1264470203&sr=8-1" book.

So few days ago I realized that I didn't remember anything about the subject and then started studying again from the ground up and chose the Sedra/Smith Microelectronics book for the task. So in this book I stumbled upon a different way of modeling the circuits, like this one:

http://img42.imageshack.us/img42/5637/diodecircuit.png

My question is: How do I rewrite this kind of circuit in a closed loop manner? The other book that I mentioned usually provided the closed loop circuit, so it was a trivial task to analyze them. But this one I have no idea, and the introductory chapter doesn't mention anything about it...

Thanks in advance.

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# Help with circuit

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