What is the primary purpose of feedback in an amplifier circuit?

The primary purpose of feedback in an amplifier circuit is to reduce distortion and stabilize gain. Feedback involves taking a portion of the output signal and feeding it back to the input. This process helps in maintaining a consistent gain across varying operating conditions and minimizes non-linearities in the amplifier's output, which are often responsible for distortion. By effectively balancing the input and output signals, feedback ensures that the amplifier operates more linearly, leading to improved fidelity and overall performance.

Feedback also influences the frequency response of the circuit, helping it to maintain a desired performance across a range of frequencies. When feedback is applied appropriately, it can significantly enhance the circuit's stability and allow for better control of amplification, which is essential for high-quality amplification in audio and communication systems.