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is buffer is required here

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sagar474

sagar474

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What is the purpose of the buffer in the circuit below, is it necessary/redundant to have a buffer ?
 

Your circuit suggests that output is connected to input, so what is in the green block doesn't matter.

You may post an actual circuit to avoid any confusion. I wire could behave as a transmission line (just as an example).
 
WimRFP said:
Your circuit suggests that output is connected to input, so what is in the green block doesn't matter.

You may post an actual circuit to avoid any confusion. I wire could behave as a transmission line (just as an example).
Click to expand...
but it is not a part of any ciricuit it is just an intreview question.
I think if there is considerable propagation delay then there will be some effect.

---------- Post added at 20:43 ---------- Previous post was at 20:43 ----------
WimRFP said:
Your circuit suggests that output is connected to input, so what is in the green block doesn't matter.

You may post an actual circuit to avoid any confusion. I wire could behave as a transmission line (just as an example).
Click to expand...
but it is not a part of any ciricuit it is just an intreview question.
I think if there is considerable propagation delay then there will be some effect. am I correct
 

You are right w.r.t. the delay.

Same reason that I mentioned the transmission (delay) line. An actual circuit like this may be an oscillator.

Given no additional info, I agree with FvM.
 
The drawing (if not misleading on purpose) suggests a signal connected to the input wire/terminal. So in the general case, the circuit involves a short respectively a logic contention.

With suitable designed strength, a superposition of signals may be reasonable though. It could e.g. work as a memory cell, if driven by a tri-state driver.

A non-inverting feedback circuit generally doesn't work as reliable oscillator, all similar technical oscillator circuits (ring oscillator, schmitt-trigger oscillator) are based on inverted feedback.
 
Hello FvM,

I was thinking of parastic oscillation, rather then intented.

As it is used during an interview, it is definitely to see how the reader reacts (to an unexpected/weird situation). I once had to explain the function of an hysteresis block to somebody with on purpose no technical knowledge at all (of course being supervised by technical people).
 
As it is used during an interview, it is definitely to see how the reader reacts.
Click to expand...
Yes, of course. As interviews are testing 1. knowledge and 2. analytical skills, I doubt that it's of much use to practice the technical part or to memorize answers to popular interview questions. Getting familiar with interview situations is helpful though.

But besides this considerations, every clear technical question should have an answer.
 
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