EC 2205
ELECTRONIC CIRCUITS I
L T P C
3 1 0 4
AIM:
The aim of this course is to familiarize the student with the analysis and design of basic transistor Amplifier circuits and power supplies.
OBJECTIVES:
•
On completion of this course the student will understand
•
The methods of biasing transistors
•
Design of simple amplifier circuits
•
Midband analysis of amplifier circuits using small - signal equivalent circuits to determine gain input impedance and output impedance
•
Method of calculating cutoff frequencies and to determine bandwidth
•
Design of power amplifiers
•
Analysis and design of power supplies.
UNIT I TRANSISTOR BIAS STABILITY
12
BJT - Need for biasing - Stability factor - Fixed bias circuit, Load line and quiescent
point. Variation of quiescent point due to hFE variation within manufacturers tolerance - Stability factors - Different types of biasing circuits - Method of stabilizing the Q point - Advantage of Self bias (voltage divider bias) over other types of biasing, Bias compensation - Diode, Thermister and Sensistor compensations, Biasing the FET and MOSFET.
UNIT II MIDBAND ANALYSIS OF SMALL SIGNAL AMPLIFIERS
12
CE, CB and CC amplifiers - Method of drawing small-signal equivalent circuit - Midband analysis of various types of single stage amplifiers to obtain gain, input impedance and output impedance - Miller's theorem - Comparison of CB, CE and CC amplifiers and their uses - Methods of increasing input impedance using Darlington connection and bootstrapping - CS, CG and CD (FET) amplifiers - Multistage amplifiers.
Basic emitter coupled differential amplifier circuit - Bisection theorem. Differential gain - CMRR - Use of constant current circuit to improve CMRR - Derivation of transfer characteristic.
UNIT III
FREQUENCY RESPONSE OF AMPLIFIERS
12
General shape of frequency response of amplifiers - Definition of cutoff frequencies and bandwidth - Low frequency analysis of amplifiers to obtain lower cutoff frequency Hybrid - n equivalent circuit of BJTs - High frequency analysis of BJT amplifiers to obtain upper cutoff frequency - Gain Bandwidth Product - High frequency equivalent circuit of FETs - High frequency analysis of FET amplifiers - Gain-bandwidth product of FETs - General expression for frequency response of multistage amplifiers - Calculation of overall upper and lower cutoff frequencies of multistage amplifiers - Amplifier rise time and sag and their relation to cutoff frequencies.
UNIT IV LARGE SIGNAL AMPLIFIERS
12
Classification of amplifiers, Class A large signal amplifiers, second harmonic distortion, higher order harmonic distortion, transformer-coupled class A audio power amplifier - efficiency of Class A amplifiers. Class B amplifier - efficiency - push-pull amplifier - distortion in amplifiers - complementary-symmetry (Class B) push-pull amplifier, Class C, Class D amplifier - Class S amplifier - MOSFET power amplifier, Thermal stability and heat sink.
UNIT V RECTIFIERS AND POWER SUPPLIES
12
Classification of power supplies, Rectifiers - Half-wave, full-wave and bridge rectifiers with resistive load. Analysis for Vdc and ripple voltage with C, L, LC and CLC filters.
Voltage multipliers, Voltage regulators - Zener diode regulator, principles of obtaining a regulated power supply, regulator with current limiting, Over voltage protection, Switched mode power supply (SMPS), Power control using SCR.
TUTORIAL = 15 TOTAL : 60 PERIODS
TEXT BOOKS:
1.
Millman J and Halkias .C., Integrated Electronics, TMH, 2007.
2.
S. Salivahanan, N. Suresh Kumar and A. Vallavaraj, Electronic Devices and Circuits, 2nd Edition, TMH, 2007.
REFERENCES:
1.
Robert L. Boylestad and Louis Nashelsky, Electronic Devices and Circuit Theory, 9th Edition, Pearson Education / PHI, 2007.
2.
David A. Bell, Electronic Devices & Circuits, 4th Ediion, PHI, 2007
3.
Floyd, Electronic Devices, Sixth Edition, Pearson Education, 2002.
4.
I.J. Nagrath, Electronic Devices and Circuits, PHI, 2007.
5.
Anwar A. Khan and Kanchan K. Dey, A First Course on Electronics, PHI, 2006.
6.
B.P. Singh and Rekha Singh, Electronic Devices and Integrated Circuits, Pearson Education, 2006.
7.
Rashid M, Microelectronics Circuits, Thomson Learning, 2007.
