Hi, LvW et all,
Thank you for your inputs and participation. I am trying to learn how to draw block diagrams structures to represent the actual schematic. Sorry for not making myself clear. Basically, my understanding is that you can represent a circuit using the normal schematic approach, small-signal approach and sort of block diagram representing the several gm or amplifier stages.
What's your opinion about this? For example, the block diagram representation is the same as the small-signal blocks? Can we say that? Are they equivalent? How?
So basically what I want to understand is the following:
For example, if you look at t his paper:
Paper 1 you will see in the first figure a block diagram representing a circuit. This block diagram is very useful, I think, to derive some equations if you are trying to understand the circuit but I don't understand how the author has put together this.
1. He draws a block diagram without showing any circuitry.
2. Then he presents 2 circuits but he doesn't say anything if it related to the block diagram constructed in figure 1.
3. Another thing that is confusing is the fact that each block has got a sign inside. Why?
4. Are they even related?
Another paper as for another example is this:
Paper 2
In this one the author starts with a block diagram, with the respective symbols inside the block. Then he draws the small signal circuit and the schematic using transistors. But the block diagram doesn't picture the capacitors, only 1. Why?
Another good example of a paper using block digrams is this one:
Paper 3
In here the author uses only diagram blocks. Why doesn't he apply that with a circuit to demonstrate which block represents which part of the circuit? What does that mean? That we can use whatever circuit we want as long as we follow the signs? But in my case I don't understand the signs.
Finally found a presentation where the author has got the block diagram side-by-side with the circuit. But the problem with the signs follows! Don't understand why do we have those signs:
Presentation 1
This one is a good example. Here the author uses the small signal to derive the equations but the other author from paper 3 uses only block diagram! How come?
Hope this was clear. Thank you very much in advance.