Analog Electronics – Page 39
Four Types of Feedback Amplifiers
Feedback amplifiers are classified based on:
- How the feedback signal is taken from output
- How the feedback signal is applied to input
Types of Feedback Amplifiers
| Feedback Type | Output Sampling | Input Mixing | Amplifier Type |
|---|---|---|---|
| Voltage Series | Voltage | Series | Voltage Amplifier |
| Voltage Shunt | Voltage | Parallel | Transresistance Amplifier |
| Current Series | Current | Series | Transconductance Amplifier |
| Current Shunt | Current | Parallel | Current Amplifier |
1. Voltage Series Feedback
- Output voltage sampled
- Feedback applied in series with input
- Increases input impedance
- Decreases output impedance
2. Voltage Shunt Feedback
- Output voltage sampled
- Feedback applied in parallel
- Reduces input impedance
- Reduces output impedance
3. Current Series Feedback
- Output current sampled
- Feedback applied in series
- Increases input impedance
- Increases output impedance
4. Current Shunt Feedback
- Output current sampled
- Feedback applied in parallel
- Reduces input impedance
- Increases output impedance
Important GATE Points
- Feedback classification depends on input mixing and output sampling
- Series mixing increases input resistance
- Shunt mixing decreases input resistance
- Voltage sampling reduces output resistance
- Current sampling increases output resistance
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