06/09/2011 1 [email protected]Semester II • Mathematics I • Fundamentals of Digital Computing • Electronics and Tele Communication Systems • Professional Communication Skill • Programming with C++ [email protected]CLASS: B. Sc (Information technology) Semester – I SUBJECT: Electronics and Communication Technology (USIT104) Periods per week Lectures - 5 3 Credits
this is also the document for telecommunication part for FY bsc-it , i hope you will get benefit , and good luck with exams
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
ELECTRONICS• Unit – I• Concept of Conductor, Semiconductor, Insulator.
Semiconductor Diode, Forward bias, Reverse Bias, Application of Diode as Rectifier, Zener diode and its applications, Introduction to Transistor (BJT, FET), PNP, NPN Transistors their Characteristic. Application of Transistor as amplifier and as a Switch.
• Unit- II• Concept of amplification, amplifier notations, Av, Ai, Ap 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.
• Unit-III• Concept of Feedback:- Negative Feedback and its advantage
• 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.
• Unit- V
• 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, companding, PCM system, differential PCM, Delta modulation. Multiplexing: - FDM/TDM. Television:-Scanning, Composite Video signal, Television Transmitter, television receiver.
• Unit-VI• Introduction to Digital Communication: PSK, ASK, FSK. • Introduction to fibre optics system:- Propagation of light in optical fibre; ray
model . Types of fibre : Single mode, steps index. Graded index. Signal
Express a period of 100 ms in microseconds, and express the corresponding frequency in kilohertz.
SolutionSolution
From Table 3.1 we find the equivalent of 1 ms.We make the following substitutions:100 ms = 100 × 10-3 s = 100 × 10-3 × 106 µs = 105 µs
Now we use the inverse relationship to find the frequency, changing hertz to kilohertz100 ms = 100 × 10-3 s = 10-1 s f = 1/10-1 Hz = 10 × 10-3 KHz = 10-2 KHz
When we change one or more When we change one or more characteristics of a singlecharacteristics of a single--frequency frequency signal, it becomes a composite signal signal, it becomes a composite signal
made of many frequencies.made of many frequencies.
The bandwidth is a property of a The bandwidth is a property of a medium: It is the difference between medium: It is the difference between
the highest and the lowest frequencies the highest and the lowest frequencies that the medium can that the medium can satisfactorily pass.satisfactorily pass.
If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz, what is the bandwidth? Draw the spectrum, assuming all components have a maximum amplitude of 10 V.
SolutionSolution
B = fh − fl = 900 − 100 = 800 HzThe spectrum has only five spikes, at 100, 300, 500, 700, and 900 (see Figure 13.4 )
A signal has a bandwidth of 20 Hz. The highest frequency is 60 Hz. What is the lowest frequency? Draw the spectrum if the signal contains all integral frequencies of the same amplitude.
A signal has a spectrum with frequencies between 1000 and 2000 Hz (bandwidth of 1000 Hz). A medium can pass frequencies from 3000 to 4000 Hz (a bandwidth of 1000 Hz). Can this signal faithfully pass through this medium?
SolutionSolution
The answer is definitely no. Although the signal can have The answer is definitely no. Although the signal can have the same bandwidth (1000 Hz), the range does not the same bandwidth (1000 Hz), the range does not overlap. The medium can only pass the frequencies overlap. The medium can only pass the frequencies between 3000 and 4000 Hz; the signal is totally lost.between 3000 and 4000 Hz; the signal is totally lost.