GOVERNMENT COLLEGE FOR MEN (A), KADAPA

Department of Electronics

B.Sc III Year -Electronics

V Semester - Syllabus

PAPER-V: Digital Electronics (60 hours)

UNIT-I (20 hours)

Number System: Binary Number System: Decimal to Binary conversion and Vice Versa. – Octal Number System: Decimal to Octal Conversion and Vice Versa, octal to Binary conversion and vice versa – Hexa Decimal Number System: Decimal to Hexa Decimal Conversion and vice versa, Hexa Decimal to Binary conversion and vice versa.

Binary Addition and Subtraction: Binary Addition – Binary subtraction using 1’s complement and 2’s complement methods

Codes: Binary coded decimal (BCD – 8421) and gray code – conversion between binary and gray codes. – ASCII Code.

UNIT-II(20 hours)

Logic Gates: OR, AND, NOT, X-OR, NAND, NOR gates - Truth tables – Positive and negative logic –TTL and CMOS logic – Universal building blocks NAND and NOR gates.

Boolean Algebra: Laws of Boolean algebra - De Morgan’s Theorems – Boolean identities – Simplification of Boolean expressions– Karnaugh Maps – Sum of products (SOP) and Product of sums (POS).

UNIT-III(20 hours)

Combinational and Sequential circuits: Multiplexer and De-Multiplexer – Decoder, Half adder and Full adder - Half Subtractor and Full Subtractor - Flip flops – RS, D, JK and JK Master-Slave (working and truth tables) - Synchronous and asynchronous binary counters, Up/Down counters- Decade counter (7490) - working, truth tables and timing diagrams.

(NOTE:Solving related problems in all the Units)

Reference Books:

  1. Digital Principles and Applications- Malvino & Leach- TMH
  2. Digital Fundamentals – F.Loyd & Jain- Pearson Education
  3. Modern Digital Electronics- R.P Jain-TMH
  4. Fundamentals of Digital Circuits- Anand Kumar- PHI
  5. Digital Systems – Rajkamal- Pearson Education
  6. Digital Electronic Principles and Integrated Circuits- Maini- Willey India
  7. Digital Electronics- Gothman-
  8. Digital Electronics –J.W. Bignel & Robert Donova- Thomson Publishers (Indian 5th Ed)

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GOVERNMENT COLLEGE FOR MEN (A), KADAPA

Department of Electronics

B.Sc III Year -Electronics

V Semester - Syllabus

PAPER-VI:Communication Electronics (60 hours)

UNIT-I (20 hours)

Modulation: Need for modulation-Types of modulation- Amplitude, Frequency and Phase modulation.

Amplitude Modulation:Amplitude modulation – Analysis of an amplitude modulated wave -side bands and band width – Power in an amplitude modulated wave – Amplitude modulator - Demodulation- diode detector.

Frequency Modulation:Frequency modulation – Frequency deviation, carrier swing modulation index, deviation ratio, percent modulation – Equation of FM wave - working of simple frequency modulator (Basic Reactance Modulator) - Ratio detection of FM waves- Advantages of frequency modulation.

UNIT-II(20 hours)

Radio Broadcasting and Reception:Radio broadcasting and reception – Transmitter – Radio receivers (AM and FM Receivers).

Pulse Modulation: Pulse amplitude modulation (PAM) – pulse time modulation (PTM) – Pulse width modulation (PWM) – Pulse position modulation (PPM)

UNIT-III(20 hours)

Digital Communications: Introduction, Bit transmission – signaling rate – Error probability, digital filtering – pulse code modulation (PCM) – coding – different codes – error detection and correction of codes.

Digital Carrier Systems:Amplitude shift keying (ASK) - Frequency shift keying (FSK) – Phase Shift Keying (PSK) – Differential Phase Shift Keying (DPSK).- (Block diagram approach for all topics in this unit).- (Block diagram approach for all topics in this unit).

(NOTE:Solving related problems in all the Units)

Reference Books:

  1. Unified Electronics Volume II by J.P Agarwal and Amit Agarwal.
  2. Electronic Communication Systems - George Kennedy & Bernard Davis - TMH.
  3. Modern Electronic Communication – Grey M Miller.
  4. Electronic Communication -D. Roddy & J. Coolen- PHI
  5. Electronic and Radio Engineering - Perman
  6. Principles of Electronic Communication Systems –Louis E. Frenzel –TMH
  7. Electronic Communications systems by Wayne Tomosi.

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Q.P.Code: 5305

GOVT. COLLEGE FOR MEN (AUTONOMOUS), KADAPA

B.Sc ThirdYear Degree V Semister Examination

Part II - Electronics

Model Question Paper

Paper-V: Digital Electronics

Time: 3 hours Max. Marks: 75

Part A (5 X 10 =50 Marks)

Answer any Five questions.

  1. Explain in detail about Binary, Decimal,Octal and Hexadecimal number systems.
  2. Explain 2’s complement method of subtraction with one example.
  3. Explain ASCII code.
  4. Draw the symbols and truth tables of OR, AND, NOT, X-OR, NAND, NOR gates.
  5. Explain TTL NAND and CMOS NOR gates.
  6. Write Boolean laws.
  7. Explain the working of multiplexer and demultiplexer.
  8. Explain in detail Half Adder and Full Adder circuits.
  9. Explain the working of RS and D Flip Flops.
  10. Explain the working Decade Counter with relevant waveforms.

Part B (5 X 5 =25 Marks)

Answer any Five questions.

  1. (a) Convert 25.62510 into binary. (b) Convert 11011.11012 to decimal.
  2. Explain BCD Code and Grey code.
  3. Why NAND and NOR gates are called universal gates.
  4. State and prove Demorgan’s theorems.
  5. Prove the following Boolean identities: (i) AC+ABC=AC (ii) (A+B)(A+C)=A+BC.
  6. Simplify the Boolean function Y=ABC+ABC+ABC+ABC+ABC by K-map method.
  7. Explain SOP and POS.
  8. Explain the working of JK Flip Flop.
  9. Explain about decoder.
  10. Explain the working of parallel binary adder.

MODEL QUESTION PAPER – MATRIX

B.Sc Electronics

Third Year –Fifth Semester

Paper-V: Digital Electronics

Part A Essay Type / Part B Short Answer Type
No. Questions / Unit / No. Questions / Unit
4 / 1 / 4 / 1
3 / 2 / 3 / 2
3 / 3 / 3 / 3

Q.P.Code:6305

GOVT. COLLEGE FOR MEN (AUTONOMOUS), KADAPA

B.Sc ThirdYear Degree V Semister Examination

Part II - Electronics

Model Question Paper

Paper-VI: Communication Electronics

Time: 3 hours Max. Marks: 75

Part A (5 X 10 =50 Marks)

Answer any Five questions.

  1. Define Amplitude Modulation and analyse amplitude modulated wave.
  2. With circuit diagram explain the working of an amplitude modulator.
  3. With circuit diagram explain the working of Reactance modulator.
  4. With circuit diagram explain the working of Ratio detection of FM waves.
  5. Draw the block diagram of a Transmitter and explain each block.
  6. Explain the Frequency Modulated (FM) Receiver.
  7. Explain about generation and demodulation of PAM.
  8. Explain about generation and demodulation of PWM, using monostable multivibrator.
  9. Explain the principle of PCM.
  10. Explain the means of generating a DPSK Signal and give method of recovering data from DPSK Signal.

Part B (5 X 5 =25 Marks)

Answer any Five questions.

  1. Explain the need for modulation.
  2. Explain the working of diode detector.
  3. What are the advantages of FM over AM.
  4. The power of an amplitude modulated signal is 2000 watts. If the modulation index is 0.75, find the power of the carrier and each side band.
  5. A frequency modulated wave has the centre frequency of 105MHz. When modulated by an audio frequency signal of 10 KHz, it has the highest frequency of 105.03MHz. Calculate (a) frequency deviation (b) lowest frequency reached by FM Wave (c) carrier swing (d) modulation index (e) percent modulation.
  6. Draw the block diagram of AM Receiver.
  7. Explain the generation of PPM signals.
  8. Explain the forward error code.
  9. Explain Amplitude Shift Keying (ASK).
  10. Explain Phase Shift Keying (PSK).

MODEL QUESTION PAPER – MATRIX

B.Sc Electronics

Third Year - Fifth Semester

Paper-VI: Communication Electronics

Part A Essay Type / Part B Short Answer Type
No. Questions / Unit / No. Questions / Unit
4 / 1 / 4 / 1
3 / 2 / 3 / 2
3 / 3 / 3 / 3

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