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Question

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David · Accepted Answer

Solution 
1.
a)  
IV--- No feedback. It works in open loop 
b)  III—Both positive as well as negative feedback is used 
c) I ---positive feedback 
d)  Instrumentation amplifier has 
High input impedance 
Differential input 
Floating output voltage
1
2 
For square wave oscillator 
Time period is given by 
        
   
   
 
Where   
  
     
 
   
   
 
 
 
 
        
  
 
 
  
 

  
 
 

3
For -90 degree phase shift 
R= 100 ohm 
C=1 uF 
R1=1K 
         (   )         (            )               
         (   )         (               )
4
Gain=(1+R2/R1)=1+4=5
5 
Resistance values are not visible. 
But I am writing the expression for output in terms of R.
   ( 
  
  
(
  
)    )
  

Solution 
a) Output B is high frequency output and Output A is low frequency output.

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