Voltage Series feedback Amplifier

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TITLE: Simulate Voltage Series Feedback Amplifier and Calculate Rif, Rof, Avf, Bandwidth

CIRCUIT DIAGRAM:

PROCEDURE:

ALL STEPS::

    ### WITHOUT  FEEDBACK###

1)  A,B Close and C Open

     Without 100k Ohm
     Without Variable Resistor

     Vin   =   50 mVpp
     Vo    =  1442   mVpp
     
      Av  = (Vo) / (Vin)
            =   28.84            
     
2)  A,B Close and C Open
     With 100k Ohm
     Without Variable Resistor

     Vin  =   50 mVpp
     Vo'  =    1312     mVpp
  
      Av  = (Vo') / (Vin)
            = 26.24 
            
      Rin =( Vo' / (Vo - Vo')) * 100K
            =     1.009M Ohm                                
      
3)  A,B Close and C Open
     Without 100k Ohm
     With Variable Resistor

    Vo" = Vo / 2
          =  1442 /2
          =     721      

     Ro=  3.5 k Ohm                       

4) For BANDWIDTH use AC SWEEP

    F (low)  =    1.4838 Hz                 
    F (high) =     2.5983 MHz                              

    BANDWIDTH = F (high) - F (low)
                            =  2.5983M - 1.4838                   
                            =   2.5982 M Hz                        

  

        ### WITH  FEEDBACK###

1)  A,B Open and C Close
     Without 100k Ohm
     Without Variable Resistor

     Vin   =   50 mVpp
     Vof    =   509.708      mVpp
     
      Avf = (Vof) / (Vin)
            =  10.19                                  
     
2)  A,B Open and C Close
     With 100k Ohm
     Without Variable Resistor

     Vin  =   50 mVpp
     Vof'  =     505.516       mVpp
  
      Avf  = (Vof') / (Vin)
            =    10.11
           
      Rinf =( Vof' / (Vof - Vo')) * 100K
            =    1.2059 M Ohm                                 
      
3)  A,B Close and C Open
     Without 100k Ohm
     With Variable Resistor

    Vof" = Vof / 2
          =   509.708   /2
          =      254.854 mVpp     

     Rof=    1.25  K Ohm                     

4) For BANDWIDTH Use AC SWEEP

    F (low)  =    0 Hz                 
    F (high) =    8.3065 MHz                                

    BANDWIDTH = F (high) - F (low)
                            =   8.3065 - 0                  
                            =    8.3065 MHz                           
################################
********************************

          
          Avf < Av
          Rinf > Rin
          Rof < Ro
          (BW)f > (BW)

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