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Types Of Negative Feedback

  1. Voltage-Series Feedback Amplifier
  • Also Called Series Voltage Feedback Amplifier.
  • Also Called Series Shunt Feedback Amplifier.
     = V0
    572.png
    In ideal Voltage Amplifier.
     
     = 0

577.png 

Fig. : Voltage series feedback amplifier

  1. Voltage Shunt Feedback Amplifier
  • Also Called Shunt Voltage Feedback Amplifier.
  • Also Called Shunt-Shunt Feedback Amplifier.

If  = VO;

AF = 582.png

  • In Ideal Transresistance Amplifier
    RIF = 0; ROF = 0

587.png 

Fig. : Voltage shunt feedback amplifier

  1. Current Shunt Feedback Amplifier
  • Shunt-Current feedback amplifier.
  • Shunt-Series feedback amplifier.

If = βIo

Af = 592.png

  • In ideal current amplifier input resistance and output resistance is
    Rif = 0
    Rof = 

597.png

 

Fig. : Current shunt feedback amplifier

  1. Current Series Feedback Amplifier
  • Also Called Series-Current Feedback Amplifier.
  • Also Called Series-Series Feedback Amplifier.
    Vf = I0
    AF = 602.png
  • In Ideal Transconductance Amplifier.
    RIF = 
    ROF = 

607.png 

Fig. : Current series feedback amplifier





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