LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – NOVEMBER 2004

PH 5401 / PHY 401 – ELECTRONICS II

 

DATE             : 01.11.04                                                                              Max. : 100 Marks

TIME :1.00 – 4.00                                                             Time : 3 Hrs

 

 

PART A

 

Answer all questions                                                  (10 X 2 = 20)

 

 

1. Calculate the voltage gain of a non-inverting amplifier with feedback resistance of 20 kW and input resistance of 1 kW.
2. State any four properties of an ideal op-amp.
3. Define the terms i) Resolution ii) linearity of A/D converter.
4. Find the analog output voltage of a 3 bit D/A converter for all possible inputs with K = 1.
5. Distinguish between discrete and integrated components.
6. Define various scales of integration of integrated circuit.
7. What is an instruction cycle?
8. What is machine cycle?
9. Tabulate the role of status lines of INTEL 8085.
10. Write an assembly language program to add two 8 bit numbers.

 

PART B

 

Answer any four                                                                 (4 X 7.5 = 30)

 

11. Set up a circuit to solve the simultaneous equations x + 2 y = 3; 2x + 3y = 5.
12. Explain the functioning of successive approximation A/D converter.
13. Write note on monolithic and thin film process used in the fabrication of IC’s
14. Discuss the functioning of the following         i)IO/M          ii) INTR         iii)INTA iv)HOLD           v)HLDA                            vi) READY      vii) RD
15. Classify 8085 instruction in various groups. Give an example of each.

 

 

PART C

 

Answer any four                                                                 (4 X 12.5 = 50)

 

16. Explain the functioning of i) logarithmic amplifier and ii) Integrator.
17. With a neat circuit diagram, explain the working of an op-amp based binary weighted D/A Converter.
18. Explain with a neat diagram how i) a resistor ii) a transistor and     iii) a diode is fabricated in an integrating circuit.
19. Draw the block diagram of INTEL 8085 and explain the same in detail.
20. Discuss the various types of addressing modes of INTEL 8085 with suitable examples.

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FG 19

FIFTH SEMESTER – APRIL 2008

PH 5401 – ELECTRONICS – II

 

 

 

Date : 06/05/2008                Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

PART A

Answer all the questions                                 (10 x 2 = 20 marks)

 

1. Give two characteristics of ideal op-amp
2. What are hybrid integrated circuits?
3. What is the advantage of R-2R ladder over weighted resistor D/A converter?
4. Draw the circuit of a non-inverting amplifier
5. What is virtual ground?
6. What are the limitations of IC?
7. What is the difference between SSI and VLSI chips?
8. Distinguish between the instructions SUB B and CMP B
9. What is the function of program counter?
10. When will the auxiliary carry flag be set

 

 

PART B                                            (4 x 7.5 = 30 marks)

Answer any four questions

 

11. Explain the construction of differentiator and integrator using op-amp

1. With a neat diagram explain A/D conversion using voltage to frequency converter
2. Explain the fabrication of monolithic IC
3. Write an assembly language program for picking largest number in an array
4. Explain memory write with bus timing diagram

 

PART C

Answer any four questions                                   (4 x 12.5 = 50 marks)

 

1. Explain the construction and theory of logarithmic amplifier
2. Explain a) parallel A/D converter    (6)

1. b) weighted resistor D/A converter

1.  a) Compare bipolar and MOS technology   (6)

6. b) Explain the IC fabrication of diode (6.5)

 

1. Write the assembly language program for
   1. Multiplying two eight bit numbers
   2. Square root of a perfect square
2. Explain the architecture of 8085 microprocessor

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – NOVEMBER 2010

PH 5404 / 5401 – ELECTRONICS – II

 

 

 

Date : 09-11-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART A

ANSWER ALL QUESTIONS                                                                                            10 x 2 = 20

1. Draw the output waveform of an integrator for a square wave input.
2. Draw the circuit diagram of a second order high pass filter.
3. For a 5 bit R-2R ladder D/A converter, calculate the output for a digital input of 10101. Assume 0 = 0V and 1 = 5V.
4. Differentiate between analog and digital signals.
5. Give any four advantages of integrated circuits.
6. Write a short note on linear IC’s.
7. What is direct addressing mode? Explain with example.
8. Write a short note on DAA instruction.
9. What do pins ALE, HLDA denote in microprocessor 8085?
10. What is the output of the following program?

MVI A, 03;     RLC;   RLC;   ADI, 01;          HLT

PART B

ANSWER ANY FOUR QUESTIONS                                                                               4 x 7.5 = 30

11. Solve the following differential equation using operational amplifiers.

d²y/dt² + 2dy/dt + 3y – 1 = 0.

12. With a neat diagram explain the working of a counter type A/D converter.
13. Discuss in detail the classification of IC’s based on their structure.
14. Write an assembly language program to determine the square root of a given number by indirect mode of addressing.
15. Write a short note on arithmetic and logical instructions.

PART C

ANSWER ANY FOUR QUESTIONS                                                                               4 x 12.5 = 50

16. What is instrumentation amplifier? Explain it with a neat diagram (5)
17. Explain in detail an Op-Amp based monostable multivibrator with a neat diagram. (7.5)
18. Explain with circuit, the working of an op-amp based 4 bit binary weighted D/A converter.
19. For a 5 bit binary weighted resistor D/A converter network, determine the following
    (i) output voltage when LSB is set. (ii) Output voltage for 11010 (iii) Full scale voltage. Assume 0 = 0V and 1 = 10V. (6)
20. Explain the fabrication of a bipolar transistor and explain how a bipolar transistor can be used as a diode.
21. Write a short note on the different registers in microprocessor 8085. (5).
22. Write an assembly language program to solve the given equation (x+y)/z by indirect mode of addressing. (7.5).
23. Write an assembly language program to sort the given set of 10 numbers in ascending order.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PHYSICS

FIFTH SEMESTER – APRIL 2012

PH 5404/5401 – ELECTRONICS – II

 

 

Date : 27-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

PART – A

Answer ALL questions                                                                                              (10×2=20)

1. Write a short note on logarithmic amplifier.
2. Calculate the cut off frequency for a second order high pass filter given R2 =10 kΩ,
   R3 =10 kΩ, C2= 1µF, C3 =1µF, R1 = 20kΩ, R2=10kΩ.
3. Differentiate analog and digital signals
4. What is meant by accuracy in a D/A converter?
5. What is meant by etching in IC terminology?
6. What is VLSI?
7. What is PSW?
8. State the difference between ADD and ADC instructions of 8085.
9. Define opcode and operand.
10. Write a program to add 05 and 04 by immediate mode of addressing in microprocessor 8085.

 

PART – B

Answer any FOUR questions                                                                                                (4×7.5 = 30)

11. Solve the following differential equation using operational amplifiers. d²y/dt² 2dy/dt+3y–1=0.
12. Explain with circuit the working of OP-AMP based integrator.
13. Discuss with a neat diagram the working of a counter type A/D converter.
14. What is addressing? Explain in detail about the different addressing modes in µP 8085.
15. Write an assembly language program to determine the smallest number in an array of 10 numbers.

 

PART – C

Answer any FOUR questions                                                                                                (4×12.5 =50)

16. With a neat diagram explain in detail the working of an OP-AMP based monostable multivibrator. Obtain the expression of the pulse width.
17. (a) Explain with circuit, the working of a 4 bit binary weighted D/A converter with OP-AMP      (6.5)

(b) For a 4 bit binary weighted resistor D/A converter determine the following (i) output voltage when MSB is set. (ii) Output voltage for 1011 (iii) Full scale voltage. Assume 0=0V and 1=5V. Rf=R/8   (6)

18. (a) Discuss in detail the fabrication of resistor. (6.5)

(b) Write short notes on linear and non-linear integrated circuits.                       (6)

19. Explain in detail about the classification of instruction sets in microprocessor 8085.
20. Write an assembly language program to evaluate the expression x²+xy+y² using subroutine.

 

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