Transfer function Electronics and Communication Engineering (ECE) Notes | EduRev

Electronics and Communication Engineering (ECE) : Transfer function Electronics and Communication Engineering (ECE) Notes | EduRev

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Determine C/R for the system given in figure below. Then put G3 = G1 G2 H2. Now the new
transfer function will be:
  • a)
  • b)
  • c)
    G1G3
  • d)
    G1G2
Correct answer is option 'D'. Can you explain this answer?

Ref: https://edurev.in/question/469665/Determine-CR-for-the-system-given-in-figure-below-


Imageto find the transfer function 
Convert the above block diagram into signal flow graph for easier analysis 
Find the forward paths  p1 p2
Find loop L1 
Find del 
Del : 1-(€ loop gains ) ( product of individual loop gains)...

Transfer function :
C/R :(pk * delk)/del
Where 
Pk is forward loop gain 
Delk is l-(gains of non touching loops to that forward path)
Finally substitute G3 
To get final answer as 

G1*G2

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