2011 Calicut University A.M.I.E.T.E Information Technology THIRD SEMESTER B.TECH. (ENGINEERING) DEGREE EXAMINATION, SEPTEMBER/OCTOBER 2011 CS/IT 09 305/PTCS 09 304-ELECTRONIC CIRCUITS (2009 Admissions) Question paper

THIRD SEMESTER B.TECH. (ENGINEERING) DEGREE
EXAMINATION, SEPTEMBER/OCTOBER 2011
CS/IT 09 305/PTCS 09 304-ELECTRONIC CIRCUITS
(2009 Admissions)
Time: Three Hours Maximum : 70 marks
Part A
Answer all questions.

1. Write any four characteristics of LED.
2. What is duty cycle ?
3. State the applications of comparator.
4. What is a flip-flop ?
5. What are the volatile and non volatile memories ?

(5 x 2 = 10 marks)
Part B
Answer any four questions.

6. Draw the equivalent circuit of PIN diode and explain it.
7. What is varicap ? Explain with a neat sketch.
8. Explain the advantages of Digital Switching.
9. Differentiate VLSI from ULSI.
10. Explain the features of MOS flip-flop.
11. Explain the significance of timing circuit in ADC.

(4 x 5 = 20 marks)
Part C
12. (a) Explain the construction and V-I characteristic of Tunnel diode with a neat energy band diagram.
Or
(b) Explain the following in detail with neat diagram :-
(i) Schmitt trigger and (ii) Step recovery diodes.

13. (a) Explain the dual gate D-MOSFETs with neat diagrams.
Or
(b) Explain the principles of wave form conversion and waveform generation using op-amps with
neat sketches.

14. (a) Draw a neat circuit diagram of CMOS NAND gate. Explain its principle of operation.
Or
(b) Explain in detail the concept of MSI,LSI and VLSI with neat sketches.

15. (a) Explain the following in detail:
(i) SRAM and DRAM.
(ii) Memory expansion.
Or
(b) Explain the principle of operation of single slop and dual slope ADC with neat diagram in
detail.
(4 x 10 = 40 marks)