Short Notes: Feedback Amplifiers | Short Notes for Electrical Engineering - Electrical Engineering (EE) PDF Download

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FAQs on Short Notes: Feedback Amplifiers - Short Notes for Electrical Engineering - Electrical Engineering (EE)

1. What is the purpose of a feedback amplifier in electrical engineering?
Ans. A feedback amplifier is used to control the gain, bandwidth, input and output impedance, and distortion of an amplifier circuit by feeding a portion of the output signal back to the input.
2. How does negative feedback help improve the performance of an amplifier?
Ans. Negative feedback reduces distortion, increases bandwidth, provides stability, and improves the linearity of the amplifier by reducing the gain and controlling the frequency response.
3. What are the types of feedback used in amplifiers?
Ans. There are two main types of feedback used in amplifiers: voltage feedback and current feedback. Voltage feedback is more common and involves feeding back a portion of the output voltage, while current feedback feeds back a portion of the output current.
4. What is the difference between voltage and current feedback in amplifiers?
Ans. In voltage feedback, a portion of the output voltage is fed back to the input, while in current feedback, a portion of the output current is fed back to the input. Voltage feedback is more common and easier to implement, while current feedback is less commonly used but can offer certain advantages in specific applications.
5. How does feedback affect the input and output impedance of an amplifier?
Ans. Feedback can reduce the input impedance and increase the output impedance of an amplifier. This can be beneficial in certain applications where matching impedances is important, but it can also introduce challenges in maintaining stability and controlling the overall performance of the amplifier.
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