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In the feedback network shown below, if the feedback factor k is increased, then the

In the feedback network shown below, if the feedback factor k is increased, then the Correct Answer input impedance increases and output impedance decreases.

There are 4 possible combinations for Voltage and Current with which we can sample at the output and mix the feedback to the input.

 Sampling:

  • At the output side, we will take a sample of output since we want to check the behavior of output and we don't want to disturb the output when we take the sample.
  • That's why when the voltage is sampled, it is in parallel (as the voltage is the same in parallel) and current in series (as the current is the same in series).


Mixing:

  • In mixing end we want to affect the signal that is provided to the amplifier since that is the actual fundament of giving the feedback.
  • So, the voltage will be in series and current will be in parallel. So that they can change the input and effect the change in output.


The four basic feedback topologies are as shown:

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[ alt="F1 S.B Madhu 19.02.20 D6" src="//storage.googleapis.com/tb-img/production/20/02/F1_S.B_Madhu_19.02.20_D6.png" style="width: 331px; height: 203px;">[ alt="F1 S.B Madhu 19.02.20 D7" src="//storage.googleapis.com/tb-img/production/20/02/F1_S.B_Madhu_19.02.20_D7.png" style="width: 348px; height: 203px;">

i) Voltage-sampling voltage-mixing (series-shunt) topology.

ii) current-sampling voltage-mixing (series-series) topology.

iii) current-sampling current-mixing (shunt-series) topology.

iv) voltage-sampling current-mixing (shunt-shunt) topology.

[ alt="26 June 1" src="//storage.googleapis.com/tb-img/production/19/08/26%20June_1.png" style="width: 160px; height: 46px;">

Parameters

Type of feedback

Voltage-series

Current-series

Current-shunt

Voltage-shunt

Output resistance/impedance (Rof)

Decre-ases

Increa-ses

Increa-ses

Decre-ases

Input resistance/impedance (Rif)

Incre-ases

Incre-ases

Decre-ases

Decre-ases

Bandwidth

Increa-ses

Increa-ses

Increa-ses

Increa-ses

Nonlinear distortion

Decrea-ses

Decrea-ses

Decrea-ses

Decrea-ses

 

 

 

 

 

 

 

 

 

 

 

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