How to Solve a Feedback Amplifier(2): Step-by-Step Tutorial

Item: How to Solve a Feedback Amplifier(2): Step-by-Step Tutorial
Rating: 4
Author: PostSingularity Institute

by Vincent Chang

Formal & Physical Sciences Engineering & Technology TJFElectronics engineering TJFCElectronics: circuits and components

🎙 Vincent Chang 👥 2K 📅 January 20, 2021 ⏱ 10 min 👁 102 📄 tutorial 🧭 2026-08-17

Available in: English (current) Français

Keywords

feedback amplifierseries-shuntloop gaininput resistanceoutput resistance

Summary

This tutorial, part two of a series, presents a step-by-step method for solving practical feedback amplifiers, specifically the series-shunt topology. The instructor, Vincent Chang, emphasizes a strategy of reduction and simplification to transform a complex practical circuit into an ideal structure, allowing the use of standard formulas. The three main steps are: sketching the A circuit (open-loop gain circuit) by duplicating the basic amplifier and adding loading resistances (ra and rb) to account for the feedback network’s loading effect; calculating the feedback factor beta using the h-parameters of the feedback network; and plugging the values into the ideal formulas for input resistance, output resistance, and closed-loop voltage gain. The video explains the derivation of ra and rb from h11 and h22, and beta from h12, with emphasis on proper circuit conditions (shorting output for ra, opening input for rb). The tutorial concludes by promising a worked example in the next video.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides a clear, structured methodology for solving feedback amplifiers, which is valuable for students and engineers. The argumentation is logical, building on previous concepts and emphasizing the importance of understanding the underlying theory. The instructor’s experience adds credibility, and the step-by-step approach is pedagogically sound. However, the video lacks concrete numerical examples and does not address potential pitfalls or variations in detail, which could limit its practical applicability.

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Title / Content Match

The title accurately describes the content: a step-by-step tutorial on solving feedback amplifiers.

Quality & Reliability

7/10

The content is based on established circuit theory and follows a systematic method. The instructor has extensive academic and industry experience. However, the video is a tutorial with limited depth and no external references, and the presentation is somewhat informal.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Contribution & Novelties

The video offers a clear pedagogical framework for solving feedback amplifiers, emphasizing the loading effect and the use of h-parameters. It bridges the gap between ideal and practical circuits, which is often challenging for students. The step-by-step approach is practical and directly applicable.

Pour aller plus loin :

Feedback amplifier — Provides a general overview of feedback amplifier theory.
Two-port network — Explains the h-parameter model used in the video.
Negative feedback — Discusses the principles of negative feedback in amplifiers.

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Radar Profile

The radar profile shows balanced scores across all dimensions, with slightly higher scores in information quantity and technical level, indicating a solid tutorial with good depth and reliability.

Reliability 7/10