Slew Rate of IC Op-Amp (3): Full-Power Bandwidth Explained

Slew Rate of IC Op-Amp (3): Full-Power Bandwidth Explained

by Vincent Chang

Formal & Physical Sciences Engineering & Technology TJFElectronics engineeringTJFCElectronics: circuits and components
🎙 Vincent Chang 👥 2K 📅 September 18, 2022 ⏱ 11 min 👁 399 📄 tutorial 🧭 2026-08-17
Available in: English (current) Français

Keywords

slew ratefull-power bandwidthop-amplarge signalbandwidth

Summary

This video is the third part of a series on the slew rate of integrated-circuit operational amplifiers. The instructor, Vincent Chang, explains the concept of full-power bandwidth (FPBW), which is the maximum frequency at which an op-amp can output a large sinusoidal signal without distortion due to slew rate limitations. He derives the formula FPBW = SR / (2πVp), where SR is the slew rate and Vp is the peak output voltage. The video emphasizes the difference between small-signal bandwidth (like unity-gain bandwidth) and large-signal bandwidth (FPBW). Using a voltage follower as an example, he shows that if the input frequency exceeds FPBW, the output becomes a triangular wave instead of a sine wave, due to the slew rate limit. The lecture concludes with a summary of key takeaways and a preview of the next topic: offset voltage.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides a clear and logical explanation of full-power bandwidth, building on previous lectures about slew rate. The derivation is straightforward and the use of a voltage follower example helps illustrate the concept. The argumentation is solid, as it connects the mathematical limit to the physical behavior of the op-amp. The instructor effectively highlights common misconceptions, such as confusing small-signal and large-signal bandwidth. However, the video does not provide practical examples or measurements, which could enhance its value.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is adequate for an educational tutorial. The instructor is experienced and the content is technically accurate. However, no external sources are cited, and the video relies solely on the instructor’s expertise. The title accurately reflects the content, and the video is well-structured. The lack of citations is a minor weakness, but the explanation is self-contained and reliable.

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Title / Content Match

The title accurately reflects the content, which focuses on explaining full-power bandwidth in the context of op-amp slew rate.

Quality & Reliability

7/10

The content is technically accurate and well-structured, but lacks formal citations and references. The instructor is experienced, and the explanation is clear, but the video is a tutorial without peer-reviewed sources.

Key Moments

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

Contribution & Novelties

This video provides a clear pedagogical explanation of full-power bandwidth, a concept often misunderstood in op-amp applications. It bridges the gap between theoretical slew rate and practical bandwidth limitations. The instructor’s emphasis on the distinction between small-signal and large-signal bandwidth is particularly valuable for students and engineers.

Pour aller plus loin :

  • Slew rate - Wikipedia — Provides a general overview of slew rate and its implications.
  • Operational amplifier - Wikipedia — Covers op-amp characteristics, including bandwidth and slew rate.
  • Full-power bandwidth - Analog Devices — A concise definition from a reputable source.

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Radar Profile

The radar profile shows a balanced performance across all dimensions, with slightly higher scores in information quality and technical level, indicating a solid educational content. The lower score in quantity of information suggests the video is concise but could benefit from more examples.

Reliability 7/10