Feedback Amplifier Topologies
Negative criticism in an enhancer is the strategy for sustaining a segment of the opened-up yield to the information yet in the inverse stage. The stage restriction happens as the intensifier gives the 180 stage move through the criticism arrangement doesn't.
While the yield vitality is being connected to the contribution, for the voltage vitality to be taken as input, the yield is taken in shunt association and for the present vitality to be taken as criticism, the yield is taken in arrangement association.
Two negative input circuits
1. Negative Voltage Feedback
2. Negative Current Feedback
Negative Voltage Feedback
In this technique, the voltage criticism of the contribution of the enhancer is relative to the yield voltage. This is additionally grouped into two sorts −
1. Voltage-arrangement criticism
2. Voltage-shunt criticism
Negative Current Feedback
In this technique, the voltage criticism to the contribution of the intensifier is corresponding to the yield current. This is additionally arranged into two kinds.
1. Current-arrangement input
2. Current-shunt input
1. Voltage-Series Feedback
In the voltage arrangement criticism circuit, a small amount of the yield voltage is connected in an arrangement with the information voltage through the input circuit. This is otherwise called shunt-driven arrangement encouraged criticism, i.e., a parallel-arrangement circuit.
The accompanying figure demonstrates the square graph of voltage arrangement criticism, by which it is clear that the criticism circuit is set in shunt with the yield yet in arrangement with the info.
2. Voltage-Shunt Feedback
In the voltage shunt criticism circuit, a small amount of the yield voltage is connected in parallel with the info voltage through the input arrangement. This is otherwise called shunt-driven shunt-sustained input i.e., a parallel-parallel proto-write.The figure demonstrates the piece outline of voltage shunt criticism, by which it is apparent that the criticism circuit is set in shunt with the yield and furthermore with the info.
3. Current-Series Feedback
In the present arrangement criticism circuit, a small amount of the yield voltage is connected in arrangement with the info voltage through the input circuit. This is otherwise called arrangement-driven arrangement nourished input i.e., an arrangement circuit.The accompanying figure demonstrates the square outline of current arrangement criticism, by which it is clear that the criticism circuit is set in arrangement with the yield and furthermore with the information.
As the criticism circuit is associated in arrangement with the yield and the contribution also, both the yield impedance and the info impedance are expanded.
4. Current-Shunt Feedback
In the present shunt criticism circuit, a small amount of the yield voltage is connected in arrangement with the info voltage through the input circuit. This is otherwise called arrangement-driven shunt-nourished input i.e., an arrangement parallel circuit.The figure demonstrates the square chart of current shunt criticism, by which it is clear that the criticism circuit is put in arrangement with the yield however in parallel with the info.
As the criticism circuit is associated in arrangement with the yield, the yield impedance is expanded and because of the parallel association with the info, the information impedance is diminished.
Give us now a chance to organize the enhancer qualities that get influenced by various sorts of negative criticisms.
Characteristics | Types of Feedback | |||
---|---|---|---|---|
Voltage-Series | Voltage-Shunt | Current-Series | Current-Shunt | |
Voltage Gain | Decreases | Decreases | Decreases | Decreases |
Bandwidth | Increases | Increases | Increases | Increases |
Input resistance | Increases | Decreases | Increases | Decreases |
Output resistance | Decreases | Decreases | Increases | Increases |
Harmonic distortion | Decreases | Decreases | Decreases | Decreases |
Noise | Decreases | Decreases | Decreases | Decreases |