FREQUENCY RESPONSE OF COMMON EMITTER AMPLIFIER |ANALOG CIRCUITS |LECTURE 02 BY MS. UMA SHARMA |AKGEC

FREQUENCY RESPONSE OF COMMON EMITTER AMPLIFIER |ANALOG CIRCUITS |LECTURE 02 BY MS. UMA SHARMA |AKGEC

🎙 Ms. Uma Sharma 👥 22K 📅 August 26, 2025 ⏱ 22 min 👁 190 📄 tutorial 🧭 2026-08-17
Available in: English (current) Français

Keywords

frequency responsecommon emitterhigh frequencyMiller effectBJT amplifier

Summary

This lecture, part of an Analog Circuits course, focuses on the high-frequency response of a common emitter (CE) amplifier. The instructor begins by reviewing the overall frequency response of amplifiers, identifying low, mid, and high-frequency bands. She then introduces the high-frequency small-signal model of the BJT, incorporating internal capacitances Cπ and Cμ. The analysis simplifies the circuit using voltage division and Thevenin’s theorem, leading to the Miller effect, which transforms the bridging capacitance Cμ into an equivalent input capacitance. The lecture derives the mid-band gain and the upper 3-dB frequency (fH) using the single-time-constant approximation. A numerical example is solved to illustrate the calculation of mid-band gain and fH. The instructor also highlights typical exam questions and suggests that the same analysis applies to MOSFETs by replacing the BJT with the MOSFET model. The presentation is clear and methodical, suitable for undergraduate engineering students.

144 words

Critical Evaluation

Value of the Information & Strength of the Argument

The lecture provides a solid, step-by-step derivation of the high-frequency response of a CE amplifier, which is a fundamental topic in analog electronics. The instructor carefully explains the simplification of the circuit using voltage division and Miller’s theorem, making the analysis accessible. The numerical example reinforces the theoretical concepts and demonstrates practical application. The argumentation is logical and follows standard textbook methods, though it relies on established formulas without deriving them from first principles. The lecture effectively bridges theory and practice, preparing students for exam-style problems.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is adequate for an educational lecture: the derivations are consistent with standard textbooks like Sedra/Smith, and the instructor references this book for the Miller effect derivation. However, no explicit citations are provided in the video, and the sources are limited to the institutional website and playlist. The title accurately describes the content, and the lecture stays on topic. The presentation is clear, but the lack of formal references and the informal style slightly reduce the overall rigor.

181 words

Title / Content Match

The title accurately reflects the content: the lecture focuses on the frequency response of a common emitter amplifier, specifically the high-frequency analysis.

Quality & Reliability

7/10

The lecture provides a clear, step-by-step derivation of the high-frequency response of a common emitter amplifier, using standard small-signal models and Miller's theorem. The content is technically accurate and aligns with established textbooks, though it lacks citations and the presentation is somewhat informal.

Key Moments

Cited Sources

Concurring Sources

  • Sedra and Smith, Microelectronic Circuits — Standard textbook referenced for the derivation of Miller effect and high-frequency analysis.

Contribution & Novelties

The lecture provides a clear pedagogical explanation of the high-frequency response of a common emitter amplifier, emphasizing the Miller effect and its impact on bandwidth. It bridges the gap between theoretical derivations and practical exam-oriented problem solving. The numerical example is particularly useful for students.

Pour aller plus loin :

95 words

Radar Profile

The radar profile shows high scores in technical level and information quality, indicating a technically solid lecture. The quantity of information is moderate, and the global reliability is good, but the lack of formal citations and the informal presentation style slightly lower the overall score.

Reliability 7/10