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Saturday, December 26, 2009

Electronics and Telecommunications Systems

Electronics
Concept  of  Conductor,  Semiconductor,  Insulator.  Semiconductor  Diode,  Forward
bias, Reverse Bias, Application of Diode as Rectifier, Introduction to Transistor (BJT,
FET), PNP, NPN Transistors their Characteristic. Introduction to Network Theorems:
- KVL,KCL, Superposition, Theremin’s, Norton’s. 
DC Biasing: - Fixed Bias, Emitter Stabilized bias, 
Voltage-  Divider  Bias  (including  problems).  Concept  of  Q-point.  Application  of
Transistor as Switch.
AC analysis of BJT Transistor using re model (including problems on Av, Ai, Zi, Zo),
Application  of  BJT  as  single  stage  Amplifier,  Frequency  response  of  single  stage
Amplifier. 
Multistage Amplifiers:- (Basics concepts) RC coupled, cascade, Darlington pair, DC
amplifiers, 
Concept  of  Feedback:-    Negative  Feedback  and  its  advantage  in  Amplification, 

Positive Feedback :-  Oscillators, Comparison  between Oscillator  and Amplifier, RC

Phase Shift Oscillator, LC Oscillator.
 Switching Circuits Multivibrators : -  Monostable using IC 555 and Actable using IC
555 (including problems), 

Voltage  Regulators:  Need  of  Voltage  regulation,  Zener  diode  basics  (including
problems  on  Zener  diode),  Series  Voltage  Regulation,  Shunt  Voltage  Regulation,
Power Amplifiers: - Class A, B, AB. Design of Single stage Amplifier using BJT. 

Telecommunication

Introduction:- Need for modulation system,  Concept of Modulation. 
AM  :-  Definition  of  AM,  Modulation  index,  Power  relation  in  AM,  Generation  and
Demodulation of AM.

 SSB:-  Power  requirement  in  comparison  with  AM,  Advantages  of  SSB  over  AM,
Concept   of   Balanced   Modulator,   Generation   of   SSB,   Pilot   Carrier   System,
Independent Side System, Vestigial Sideband Transmission. 

  FM: - Definition of FM, Bandwidth, Noise triangle, Per-emphasis and De- emphasis.
PM:  -  Definition  of  PM.  Difference  between  AM  and  FM.    Radio  receivers.  Pulse

Modulation:-  Sampling Theorem, PAM, PTM, PWM, PPM, pulse code modulation,
Quantization noise, commanding, PCM system, differential PCM, Delta modulation.

Multiplexing: - FDM/TDM. Television:- Scanning, Composite Video signal, Television
Transmitter, television receiver. 
Introduction to Digital Communication: PSK, ASK, FSK.

Introduction to fiber optics system:-  Propagation of light in  optical fiber; ray model .
Types  of  fiber  :  Single  mode,  steps  index.  Graded  index.  Signal  distortion:
attenuation, dispersion. Optical sources: LED, LASERS. Optical Detectors and optics
links. Link Budget.

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