JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• To understand the operation, design and analysis of single stage amplifiers using BJT & FET.
• To understand the concept of feedback amplifiers, large signal amplifiers and oscillators.
• To understand the operation of wave shaping circuits.
• To understand the switching characteristics of diode and transistor.

Course Outcomes

At the end of the course, the student will be able to:

• Apply the knowledge of BJT to design practical amplifier circuits.
• Design electronic subsystems such as feedback amplifiers, oscillators and power amplifiers to meet the required specifications.
• Design wave shaping circuits with different inputs.

UNIT - I

Single Stage Amplifiers: Review of CE, CB & CC configurations, Classification of Amplifiers, analysis of transistor amplifier using h-parameter model, analysis of CE, CB & CC amplifiers using exact and approximate model (simplified model), comparison of CE, CB & CC amplifiers, distortion in amplifiers, low frequency analysis, low frequency response of BJT amplifiers & FET amplifiers, UJT and its characteristics.

UNIT - II

Feedback Amplifiers: Concept of feedback, types of feedback amplifiers, general characteristics of negative feedback amplifiers, effect of feedback on amplifier characteristics, voltage series feedback amplifier, voltage shunt feedback amplifier, current series feedback amplifier, current shunt feedback amplifier feedback configurations. Illustrative problems and applications of feedback amplifier.

UNIT - III

Stability & Oscillators: Classification of oscillators – sinusoidal oscillators, resonant oscillators, condition for oscillations (Barkhausen Criterion), generalized analysis of LC Oscillators – Hartley oscillator, Colpitt’s oscillator, Clapp oscillator and crystal oscillator, RC Oscillators – RC Phase shift oscillator, Wien-bridge oscillator, frequency and amplitude stability of oscillators and applications of oscillators.

UNIT - IV

Large Signal Amplifiers: Introduction, classification of power amplifiers, class – A power amplifier, maximum efficiency of class – A amplifier, transformer coupled amplifier, class – B amplifier, transformer coupled push pull amplifier, complimentary symmetry amplifier,

transistor power dissipation, thermal runaway, thermal stability and heat sinks, application of large signal amplifiers.

UNIT - V

Switching Characteristics of Devices & Wave Shaping Circuits: DIODE as a switch, piecewise linear diode characteristics, transistor as a switch, breakdown voltage consideration of transistor, design of transistor switch, transistor switching times.

Clippers & Clampers: Diode clippers, transistor clippers, clipping at two independent levels, transfer characteristics of clippers, comparators, clamping circuits using diode with different inputs, clamping circuit theorem, practical clamping circuits and applications of clippers and clampers.

TEXT BOOKS:

• 1. Electronic Devices and Circuit Theory – R. L. Boylestad and Louis Nashelsky, 10 Ed., 2009, PEI/PHI.
• 2. Electronic Devices and Circuits – S. Salivahanan, N. Suresh Kumar, A. Vallavaraj, 2 Ed., 2008, TMH.
• 3. “Solid State Pulse Circuits - David A. Bell, 4th Ed, 2007, PHI.

REFERENCE BOOKS:

• 1. Introductory Electronic Devices and Circuits – Robert T. Paynter, 7th Ed, 2009, PEI
• 2. Electronic Devices and Circuits – Anil K. Maini, Varsha Agarwal, 1 Ed., 2009, Wiley India Pvt. Ltd.
• 3. Pulse Digital & Switching Waveforms – Jacob Millman, Harbert Taub and Mothiki S Prakash Rao, 2nd Ed, 2008, TMH.