EC 1 - Electronics Circuits I Syllabus

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147304 ELECTRONIC CIRCUITS I 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.

OBJECTIVE

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 9

BJT – Need for biasing – Stability factor - Fixed bias circuit, Load line and quiescent 

point. Variation of quiescent point due to 

FE

h 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 9

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 9

General shape of frequency response of amplifiers - Definition of cutoff frequencies and 

bandwidth - Low frequency analysis of amplifiers to obtain lower cutoff frequency Hybrid 

–  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.9

UNIT IV LARGE SIGNAL AMPLIFIERS 9

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 9

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 

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, 

2ndEdition, TMH, 2007.

REFERENCES

1. Robert L. Boylestad and Louis Nashelsky, Electronic Devices and Circuit Theory, 9thEdition, Pearson Education / PHI, 2007.

2. David A. Bell, Electronic Devices & Circuits, 4thEdiion, 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, 2007.10