Tow-Thomas Biquad Filters (3): Hand Analysis & Simulation

Tow-Thomas Biquad Filters (3): Hand Analysis & Simulation

by Vincent Chang

Formal & Physical Sciences Engineering & Technology TJFElectronics engineeringTJFCElectronics: circuits and components
🎙 Vincent Chang 👥 2K 📅 May 9, 2021 ⏱ 14 min 👁 5K 📄 tutorial 🧭 2026-08-17
Available in: English (current) Français

Keywords

Tow-Thomas biquadband-pass filterlow-pass filterhand analysissimulation

Summary

This video is the third part of a series on Tow-Thomas biquad filters, presented by Vincent Chang. The instructor first analyzes a band-pass Tow-Thomas biquad filter by hand, deriving its transfer function using nodal analysis and Ohm’s law. He explains how to determine the center frequency, bandwidth, and gain from the component values. Then, he introduces a low-pass version of the filter and encourages viewers to derive its transfer function before showing simulation results. He reconciles the simulated DC gain with the hand-calculated value, explaining the role of resistors R4 and R6. The video concludes with a summary of key takeaways and a preview of the next topic on switched-capacitor filters. The presentation is clear and methodical, suitable for students or engineers familiar with basic circuit analysis.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides valuable insights into the analysis and design of Tow-Thomas biquad filters, a common building block in analog IC design. The hand analysis is thorough, walking through each step of deriving the transfer function. The argumentation is logical and well-structured, with clear explanations of how component values affect filter parameters. The simulation results are used to validate the hand analysis, reinforcing the concepts. The instructor’s teaching style is effective, encouraging active learning by prompting viewers to attempt the analysis themselves.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is high for a tutorial: the derivations are correct and the simulation results align with theoretical predictions. However, the video does not cite any external sources or references, relying solely on the instructor’s expertise. The title accurately describes the content, which is focused on hand analysis and simulation. No comments were provided for analysis.

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Title / Content Match

The title accurately reflects the content, which focuses on hand analysis and simulation of Tow-Thomas biquad filters.

Quality & Reliability

8/10

The video is a clear, step-by-step tutorial on Tow-Thomas biquad filters, with hand analysis and simulation reconciliation. The instructor is an experienced educator, and the content is technically accurate, though it lacks citations and references.

Key Moments

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

Cited Sources

Concurring Sources

  • Tow-Thomas biquad filter - Wikipedia — Provides a general description of the Tow-Thomas biquad filter, which aligns with the video's content.

Contribution & Novelties

This video offers a clear, step-by-step tutorial on Tow-Thomas biquad filters, bridging hand analysis and simulation. It is particularly useful for students and engineers learning analog filter design. The reconciliation between theoretical and simulated results reinforces understanding.

Pour aller plus loin :

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Radar Profile

The radar profile shows high scores in information quality, technical level, and reliability, with a slightly lower score in information quantity due to the focused scope of the tutorial. This indicates a well-executed educational video with solid technical depth.

Reliability 8/10