Courses » Analog Circuits

Analog Circuits


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.

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Nagendra Krishnapura is an associate professor in the VLSI group of the department of Electrical Engineering of the Indian Institute of Technology, Madras. He works in the area of analog and mixed-signal integrated circuits and signal processing. 

He graduated with a Ph.D. from Columbia University, New York in Oct. 2000. He obtained his B. Tech. degree in Electronics and Communications Engineering from the Indian Institute of Technology, Madras, in 1996. Between 2000 and 2005, he worked as a senior design engineer at Celight, Inc. and Multilink(later Vitesse Semiconductor) where he designed integrated circuits for high speed communications. From 2003 to 2005, he was an Adjunct Assistant Professor and taught courses on Analog Circuit Design at Columbia University. 


Typical 1st and 2nd year EE curriculum. Specific pre-requisite courses are:

1. Basic Electrical Circuits 
(e.g. http://nptel.ac.in/courses/117106108/   or https://onlinecourses.nptel.ac.in/iitm_ec_1010/preview)

2. Networks and Systems 
(e.g. http://nptel.ac.in/courses/108106075/)


We will have a total of 11 weeks for this course. Certification will be based on the contents of the first 8 weeks. The last 3 weeks(shown in gray below) will contain additional material. There will be about 2.5-3 hours of lectures every week. This course is aimed at 2nd or 3rd year undergraduate students who have already finished a course on basic electrical circuits and are familiar with circuit analysis. This is intended to the be the second course on electronic circuits in the undergraduate curriculum. 


·         The exam is optional. 

·         The exam will be based on the first 8 weeks of the course. 

·         Exams will be on 6 September 2015 and 13 September, 2015. 

·         Time: 1pm-4pm

·         The list of cities where the exam will be conducted will be available in the registration form. 

Registration url: Announcements will be made when the registration form is open for registrations, most likely in July 2015. The online registration form has to be filled and the certification exam fee of Rs 1000, needs to be paid.


Certificate will be given to those who register and write the exam. Certificate will have your name, photograph and the score in the final exam. It will also have the logos of NPTEL and IIT Madras. It will also be e-verifiable on the nptel.ac.in/noc website.


Week Unit contents
1 Course introduction; Need for nonlinear circuits; Incremental analysis of nonlinear circuits; Diode and its models; Incremental picture of a two port nonlinear circuit
2 Constraints on y-parameters and large signal characteristics to obtain a high gain; MOS transistor and its characteristics; AC coupling network to add signal to bias; AC coupling at input and output; Common source amplifier
3 Output conductance of a MOS transistor; Inherent gain limitation of a transistor; Sensitivity of gm to transistor parameters; Biasing a transistor at a constant current; Drain feedback configuration; Current mirror
4 Common source amplifier using drain feedback; Common source amplifier using current mirror bias
5 Common source amplifier using source feedback bias; Using a resistor instead of a current source for biasing; Further biasing techniques; VCVS using a transistor; Source follower biasing
6 CCVS using a transistor; CCVS using an opamp; Biasing a CCVS; Emitter degenerated amplifier
7 Common gate amplifier and its biasing; VCCS using a transistor and its biasing
8 pMOS transistor and its small signal model; Biasing a pMOS transistor; Converting nMOS circuits to pMOS; Amplifiers using a pMOS transistor
9 Bipolar junction transistor-large and small signal models; BJT circuits- Biasing; Common source amplifier; Emitter follower
10 BJT Common base amplifier, Transimpedance amplifier; Swing limits of amplifiers
11 Two transistors in feedback; Two transistors in feedback