Telecommunication Systems

This subject is basically divided into two parts, one Electronics and the other Telecommunication. Electronics includes the study of transistors, Networking Theorems, Multivibrators (Used in Motherboard Circuits), Power Supply, Zenar diodes etc. Telecommunication includes TV Receiver, TV signal, Amplitude Modulation, Frequency Modulation etc. This subject has the maximum number of Topics so one has to prepare well in advance!

Reference: Principles of Electronics by V.K.Mehta, Semiconductor Devices by Patil & Chitnis


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 , Norton B
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.

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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