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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 26 - Problems with the Basic Amplifier Structure

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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 g_ds on a Common Source Amplifier, Inherent Gain Limit of a Transistor

Lecture 36 - Variation of g_m with Transistor Parameters

Lecture 37 - Variation of g_m with Constant V_gs 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 V_GS 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