[e2e] feedback mechanisms and network modelling.

[Cannara]

Alok, get a text on feedback-control systems, or amplifier design, and it will
explain how the phase delay through the gain and feedback sections of any such
system define ultimate behavior.  Note that you build an amplifier with
certain phase behaviors and an oscillator with others.  You don't want the
latter.  Also note that a fundamental assumption in these analyses is accuracy
of the feedback path -- that's a difficult assumption in networks.

Alex

alok wrote:
> 
> Hi,
> 
> I would like to know the following as it has been confusing me for sometime,
> 
> Lets say I was to model a "network behaviour" with some inbuilt feedback in
> a model similar to lets say, a common emitter amplifier 3 pin transistor
> circuit.
> 
> In such circuits, the fundamental assumption while defining the "s" domain
> functions and making an input versus output plot is that "signal propogation
> is immediate".
> 
> The moment i put a signal in the Base side circuit, I assume the Emitter
> side would react etc. and plot the function.
> 
> My questions
> 1. is this based on a fundamental assumption that speed of
> light/current/wavelet/whatever is inifinity? I guess yes....
> 2. When trying to apply similar models to networks where "distance" plays a
> role, how does when consider the "time lag" for propogation in the
> mathematical equations?
> 
> thanks and rgds
> Alok