Cognitive Scaffold

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MENTAL MODEL · M10776

Bode Plot

Bode Plot
SystemsHigh supportSystems Theory
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A Bode plot is a dual graph with frequency on the horizontal axis, plotting system gain (dB) and phase (degrees) respectively, used to analyze the frequency response characteristics of a system.

SCAFFOLDING EFFECT

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A system health check table. At a glance, you can see at which frequencies the system amplifies, attenuates, or delays, and judge stability and performance.

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Take the logarithm of the transfer function to obtain the gain (20log|G|, dB) and phase ∠G curves against frequency (logarithmic horizontal axis). The phase margin at the gain crossover (0 dB) and the gain margin at the phase crossover (-180°) are core indicators for judging closed-loop stability.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Bode_plotZH · Explicit
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