Analog Devices and Circuits : Amplifiers analysis

Name: Analog Devices and Circuits : Amplifiers analysis
Rating: 3.8 (16 reviews)

DC and AC Analysis of Transistor , Feedback amplifiers

Created byVasudevan B, Dr.S.UMA MAHESWARI, Dr.S. Latha

Last updated 7/2026

English

What you'll learn

Understand and analyze the characteristics of BJT and MOSFET devices, including their structure, operation, biasing techniques
Design and evaluate single-stage and multistage transistor amplifiers BJT and MOSFET using small-signal models, with emphasis on gain, input, output impedance,
Apply feedback principles in amplifier design by studying different feedback topologies and their effects on stability, gain, bandwidth, and distortion.
Design and analyze practical oscillator circuits RC, Wein Bridge, Hartley, Colpitts, and Crystal and determine conditions for sustained oscillations.

Course content

7 sections • 76 lectures • 16h 44m total length

Introduction15:02
Understand the working of BJT
Transistor DC Line and Operating point15:03
Understanding the Basic parameters of Transistor
Operating Point of Transistor14:34
Understand the concept of DC Load line and Operating Point
Stability of Operating Point9:21
Understanding the stability of Operating Point
BJT-Fixed bias14:39
Fixed bias analysis - Finding the Operating point and Designing.
Voltage Divider Bias13:42
Explain the voltage divider bias for a BJT, using a Thevenin base source to stabilize the operating point through negative feedback, and design RC, R1, R2 for a given VCC.
Biasing of FET and MOSFET13:02
Explore mosfets, including depletion and enhancement modes for n-channel and p-channel devices, and how gate-source voltage sets drain current through fixed bias, voltage-divider bias, and drain-feedback bias.

Small signal analysis of BJT CE amplifier18:06
Hybrid - Pi model with Early Effect5:27
Analyze the hybrid pi model with the early effect, including r_pi, g_m v_pi, and r_naught. Derive IC with early effect and find r_naught from changes in output voltage and current.
Analysis of Common Base amplifier14:10
Analyze the common base amplifier using the hybrid-pi model to derive the small-signal voltage gain, showing gm times RC parallel RL when the base is grounded.
Analysis of Common Collector amplifier11:22
Analyze the common collector amplifier with the hybrid pi model. Derive the voltage gain as 1 + beta times (r_naught parallel with r) and identify input and output resistances.
Small Signal low frequency analysis of CE with Emitter Resistance15:05
Analyze small-signal low-frequency behavior of a CE amplifier with emitter resistance, using voltage-divider bias, a coupling capacitor, and the hybrid-pi model; emitter degeneration stabilizes the Q point and yields gain.
Problem Solving Session 111:44
Problem Solving Session - 24:48
Analyze early effect in an amplifier by placing r_naught in parallel with RC, showing the voltage gain drops from -11.4 to -10.2 for the same circuit.
Small Signal Analysis of MOSFET19:12
Explore the mosfet small-signal model by introducing mosfet basics, depletion and enhancement modes, the hybrid-pi equivalent, transconductance gm, and output resistance ro with channel length modulation.
MOSFET- Common Source Amplifier analysis6:25
Designs and analyzes a mosfet common-source amplifier using a hybrid-pi model, derives the voltage gain and output resistance, and highlights the roles of gm, r naught, rd, and biasing components.
MOSFET - Analysis of Common Source with source resistance.7:04
Explore the common-source MOSFET amplifier with a source resistor, using the hybrid-pi model to derive the voltage gain av equals minus gm rd divided by one plus gm rs.
MOSFET - Common Gate Analysis13:31
MOSFET-Common Drain analysis14:06
Analyze the MOSFET common drain (source follower) amplifier using the hybrid-pi model, detailing biasing with R1 and R2, Rs, and R0, and deriving the voltage gain and input resistance.
Problem Session - 111:44
Solve the dc q-point to determine Ic and Vc, then compute the small-signal gain using gm, r_pi, RC, and RB, yielding Av ≈ -11.4.
Problem Session - 24:48
Analyze the early effect on amplifier gain using an early voltage of 50 v and the output resistance, showing gain from -11.4 to -10.2.

Introduction on Transistor Amplifier22:28
BJT, MOSFET Amplifiers21:13
AC Analysis16:05
Common Emitter Amplifier - AC Analysis17:50
CE Amplifier Problem 18:33
CE Amplifier Problem 28:14
Common Collector Amplifier - AC Analysis26:19
CC Amplifier - Problem8:38
Common Base Amplifier - AC Analysis13:38
CB Amplifier - Problem5:33
Introduction on Frequency response analysis of BJT CE Amplifier18:10
Introduction on Frequency response analysis of BJT CB Amplifier15:35
Introduction on Frequency response analysis of BJT CC Amplifier13:40
Introduction on Multistage Amplifier23:35
2 Stage Cascaded CE Amplifier15:21
Numerical in 2 stage CE Amplifier9:22
Darlington Transistor11:04
Numerical in Darlington Transistor8:03
Cascode Amplifier10:18
Numerical in Cascode Amplifier16:08
Frequency Response Analysis of BJT CE Amplifier7:30
Input Coupling Capacitor Effect in Frequency Response - CE Amplifier13:35
Coupling and Load Capacitor Effect in Frequency Response - CE Amplifier9:42
Bypass Capacitor Effect in Frequency Response - CE Amplifier12:42
Numericals in Frequency Response of CE Amplifier20:35
AC Analysis of MOSFET Amplifier22:35
Graphical Analysis and Load Line - NMOS CS Circuit19:51
Common Source Amplifier - AC Analysis9:55
CS Amplifier with Source Resistor, Source Bypass Capacitor9:16
Numericals 1 in Common Source Amplifier11:44
Numericals 2 in Common Source Amplifier15:50
Common Drain Circuit11:59
Numericals in Common Drain Circuit23:32
Common Gate Circuit11:04
Numericals in Common Gate Circuit15:56
Capacitor Effect in Common Source Circuit11:05

Introduction to Feedback amplifiers7:11
Explain how feedback amplifiers route part of the output back to the input via a beta network, compare positive and negative feedback, and derive the positive-gain formula a/(1−aβ).
Voltage Series configuration8:44
Explains the voltage series (series-shunt) amplifier, where input is in series and output in parallel; derives AVF = AV/(1+βAV), and notes input resistance rises while output resistance falls.
Current Series Configuration7:04
Explore the current series configuration, where feedback converts current to voltage and creates a transconductance amplifier, deriving the current-to-voltage transfer ratio and showing input and output resistances rise.
Current Shunt Configuration8:44
analyze the series shunt voltage amplifier, where input is series and output is parallel; derive avf = av/(1+βav), note input resistance rises and output resistance falls with feedback.
Voltage Shunt Configuration6:20
Analyzing the shunt configuration, the lecture explains the transresistor current-to-voltage amplifier, where feedback samples output voltage and converts it to current, yielding a transresistor transfer with gain a.

RC Phase Shift Oscillator Working explanation6:52
RC Phase Shift Oscillator is a Low frequency Oscillator which is mainly used in Audio Frequency Applications.
RC Phase Shift Oscillator Practical Session7:21
Hartley Oscillator7:49
Hartley Oscillator is a high frequency Oscillator which is mainly used in RF applications.
Hartley Oscillator Practical Session7:10
Wein Bridge Oscillator32:56
Second Order Filter12:09
Power Amplifier5:47
Harley Oscillator Part 246:00
Narrow band pass filter18:01

Requirements

This course requires no prerequisites — we start from scratch, making it perfect for beginners, while still offering depth for advanced learners

Description

Welcome to this comprehensive course on Electronic Devices and Circuits, designed to provide you with both clarity in fundamentals and confidence in applications. Whether you are a beginner stepping into electronics or a learner aiming to strengthen your foundation, this course will guide you through the most essential concepts with a clear, structured approach.

In Session 1, we begin with the DC characteristics of transistors, where you will understand how biasing establishes a stable operating point and ensures reliable circuit performance. This strong foundation is essential before moving into dynamic circuit behavior.

In Session 2, we explore the small-signal AC analysis of transistors. You will learn how signals are amplified, how gain is controlled, and how real-world circuits are designed to balance efficiency and performance. This session bridges theory with practical applications, giving you a deeper appreciation of amplifier design.

In Session 3, the course concludes with an insightful journey into feedback amplifiers. Here, you will discover how feedback enhances stability, reduces distortion, and improves precision in electronic systems.

By the end of this course, you will not only master these fundamental topics but also develop the confidence to analyze and design circuits that form the backbone of modern electronics.

Who this course is for:

Undergraduate ECE students who want to strengthen their understanding of analog devices and circuits.
Electronics hobbyists and beginners curious about how transistors, amplifiers, and oscillators work.

Analog Devices and Circuits : Amplifiers analysis

What you'll learn

Explore related topics

Course content

Transistor Characteristics7 lectures • 1hr 35min

Analysis of Transistor Amplifiers14 lectures • 2hr 38min

Analysis of Transistor Amplifier36 lectures • 8hr 37min

Feedback Amplifiers5 lectures • 38min

Frequency Response of Common Emitter Amplifier2 lectures • 29min

Oscillators9 lectures • 2hr 24min

Operational Amplifiers3 lectures • 23min

Requirements

Description

Who this course is for: