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Analog Circuits

Analog Circuits. Instructor: Dr. Nagendra Krishnapura, Department of Electrical Engineering, IIT Madras. This course is an introduction to amplifiers using transistors. Students will be introduced to MOS transistors, their characteristics, techniques for biasing them, and amplifiers using them. The basic transistor amplifier stages are seen as realizations of different controlled sources using negative feedback. Small- and large-signal characteristics of each amplifier will be discussed. At the end of this course, students should be able to recognize and analyze the basic amplifiers and biasing arrangements using MOS or bipolar transistors. (from nptel.ac.in)

Lecture 08 - Incremental Equivalent Circuit


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Obtaining Power Gain - Need for Nonlinearity
Lecture 01 - Course Introduction
Lecture 02 - Obtaining Power Gain
Lecture 03 - Obtaining Power Gain using a Linear Two Port
Lecture 04 - One Port (Two Terminal) Nonlinear Element
Lecture 05 - Nonlinear Circuit Analysis
Lecture 06 - Small Signal Incremental Analysis - Graphic View
Lecture 07 - Small Signal Incremental Analysis
Lecture 08 - Incremental Equivalent Circuit
Lecture 09 - Large Signal Characteristics of a Diode
Lecture 10 - Analysis of Diode Circuits
Lecture 11 - Small Signal Model of a Diode
Lecture 12 - Two Port Nonlinearity
Lecture 13 - Small Signal Equivalent of a Two Port Network
Lecture 14 - Small Signal Equivalent Circuit of a Two Port Network
MOS Transistor; Common Source Amplifier
Lecture 15 - Gain of a Two Port Network
Lecture 16 - Constraints on Small Signal Parameters to Maximize the Gain
Lecture 17 - Constraints on Large Signal Characteristics to Maximize the Gain
Lecture 18 - Implications of Constraints in terms of the Circuit Equivalent
Lecture 19 - MOS Transistor - Description
Lecture 20 - MOS Transistor Large Signal Characteristics
Lecture 21 - MOS Transistor Large Signal Characteristics - Graphical View
Lecture 22 - MOS Transistor Small Signal Characteristics
Lecture 23 - Linear (Triode) Region of the MOS Transistor
Lecture 24 - Small Signal Amplifier using the MOS Transistor
Lecture 25 - Basic Amplifier Structure
Lecture 26 - Problems with the Basic Amplifier Structure
Lecture 27 - Adding Bias and Signal - AC Coupling
Lecture 28 - Common Source Amplifier with Biasing
Lecture 29 - Common Source Amplifier: Small Signal Equivalent Circuit
Lecture 30 - Common Source Amplifier Analysis: Effect of Biasing Components
Lecture 31 - Constraint on the Input Coupling Capacitor
Lecture 32 - Constraint on the Output Coupling Capacitor
MOS Output Conductance; Biasing a Transistor at a Constant Current; Drain Feedback Bias
Lecture 33 - Dependence of Id on Vds
Lecture 34 - Small Signal Output Conductance of a MOS Transistor
Lecture 35 - Effect of gds on a Common Source Amplifier, Inherent Gain Limit of a Transistor
Lecture 36 - Variation of gm with Transistor Parameters
Lecture 37 - Variation of gm with Constant Vgs and Constant Drain Current Bias
Lecture 38 - Negative Feedback Control for Constant Drain Current Bias
Lecture 39 - Types of Feedback for Constant Drain Current Bias
Lecture 40 - Sense at the Drain and Feedback to the Gate-Drain Feedback
Lecture 41 - Intuitive Explanation of Low Sensitivity with Drain Feedback
Lecture 42 - Common Source Amplifier with Drain Feedback Bias
Lecture 43 - Constraint on the Gate Bias Resistor
Lecture 44 - Constraint on the Input Coupling Capacitor
Lecture 45 - Constraint on the Output Coupling Capacitor
Lecture 46 - Input and Output Resistances of Common Source Amplifier with Constant VGS Bias
Current Mirror Bias; Source Feedback Bias; Common Source Amplifiers
Lecture 47 - Current Mirror
Lecture 48 - Common Source Amplifier with Current Mirror Bias
Lecture 49 - Constraint on Coupling Capacitors and Bias Resistance
Lecture 50 - Diode Connected Transistor
Lecture 51 - Source Feedback Biasing
Lecture 52 - Common Source Amplifier with Source Feedback Bias
Lecture 53 - Constraints on Capacitor Values
Lecture 54 - Sensing at the Drain and Feeding Back to the Source
Lecture 55 - Sensing at the Source and Feeding Back to the Gate
Lecture 56 - Ensuring that Transistor is in Saturation
Lecture 57 - Using a Resistor instead of Current Source for Biasing
Lecture 58 - Quick Tour of Amplifying Devices
Controlled Sources using a MOS Transistor
Lecture 59 - Controlled Sources using a MOS Transistor - Introduction
Lecture 60 - Voltage Controlled Voltage Source
Lecture 61 - VCVS using a MOS Transistor
Lecture 62 - VCVS using a MOS Transistor - Small Signal Picture
Lecture 63 - VCVS using a MOS Transistor - Complete Circuit
Lecture 64 - Source Follower: Effect of Output Conductance; Constraints on Coupling Capacitors
Lecture 65 - Voltage Controlled Current Source using a MOS Transistor
Lecture 66 - VCCS using a MOS Transistor: Small Signal Picture
Lecture 67 - VCCS using a MOS Transistor: Complete Circuit
Lecture 68 - VCCS using a MOS Transistor: AC Coupling the Output
Lecture 69 - Source Degenerated CS Amplifier
Lecture 70 - Current Controlled Current Source using a MOS Transistor
Lecture 71 - CCCS using a MOS Transistor: Small Signal Picture
Lecture 72 - CCCS using a MOS Transistor: Complete Circuit
Controlled Sources; Negative Feedback and Virtual Short
Lecture 73 - Current Controlled Voltage Source using a MOS Transistor
Lecture 74 - CCVS using a MOS Transistor: Gain
Lecture 75 - CCVS using a MOS Transistor: Input and Output Resistances
Lecture 76 - CCVS using a MOS Transistor: Complete Circuit
Lecture 77 - Voltage Controlled Voltage Source using an Op-Amp
Lecture 78 - Current Controlled Voltage Source using an Op-Amp
Lecture 79 - Negative Feedback and Virtual Short in an Op-Amp
Lecture 80 - Negative Feedback and Virtual Short in a Transistor
Lecture 81 - Constraints on Controlled Sources using Op-Amps and Transistors
Lecture 82 - Summary of Basic Amplifiers
Lecture 83 - Signal Swing Limits in Amplifiers
Lecture 84 - Swing Limit due to Transistor Entering Triode Region
Lecture 85 - Swing Limit due to Transistor Entering Cutoff Region
Lecture 86 - Swing Limit Calculation Example
Lecture 87 - Swing Limits - More Calculations
pMOS Transistor
Lecture 88 - pMOS Transistor
Lecture 89 - Small Signal Model of the pMOS Transistor
Lecture 90 - Common Source Amplifier using the pMOS Transistor
Lecture 91 - Swing Limits of the pMOS Common Source Amplifier
Lecture 92 - Biasing a pMOS Transistor at a Constant Current; pMOS Current Mirror
Lecture 93 - Converting nMOS Transistor Circuits to pMOS
Lecture 94 - Bias Current Generation
Lecture 95 - Examples of More Than One Transistor in Feedback