Feedback in Amplifier | Gain with Feedback | Positive and negative feedback
This video discusses the 1st equivalent circuit of voltage, current, trans-conductance, and trans-resistance amplifier. Then basic architecture and block diagram of the feedback amplifier is discussed. Gain with feedback is also derived.
Next video: Feedback Topology and Advantages of negative feedback. Explore the playlist: • EC2019: EDC
Concept of Feedback amplifier: If a certain portion of the output signal is extracted using a network and mixed with the input signal, then a significant change occurs in the amplifier characteristics. There are two types of feedback: negative and positive. If the gain of the amplifier reduces after the application of feedback then it's negative feedback. If the overall gain increases then it's positive feedback. Negative feedback improves stability and is widely used in amplifier circuits, whereas positive feedback leads to unstable systems and designs oscillators or waveform generators.
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