Digital Circuits and Systems (IT-305) - Important Questions

Convert the following numbers as directed (any two): i) (11011.11)2 = ( )10 ii) (5321)6 = ( )11 iii) (125.89)10 = ( )BCD iv) (178)9 = ( )6 including fractional parts between binary, octal, decimal, hexadecimal and BCD.

Explain BCD code, Excess-3 code and Gray code with their applications/uses.

Minimize the following Boolean function using K-map method to find minimal SOP: f(P,Q,R,S) = a3m(0,1,4,5,7,8,9,12,13,15).

Explain full adder with truth table and logic diagram and implement full adder using two half adders.

Describe full subtractor with truth table, K-map simplification and logic diagram.

Design a 4-to-16 decoder using 3-to-8 decoders and explain its operation.

Implement AND, OR, NOT gates / a given Boolean function using NOR gates only. Draw logic diagrams.

Design a synchronous counter using JK flip-flops for the sequence 000, 101, 110, 111, 011, 010, 000.

What is a register? Differentiate between serial and parallel registers with example and diagram.

What does edge triggered and level triggered mean? Differentiate between edge triggered and level triggered flip-flops.

Design and explain the working of a 2-input totem-pole TTL NAND gate with circuit diagram.

Explain and compare NMOS, PMOS and CMOS logic families, their construction, operation and characteristics.

List the various types of Analog to Digital (A/D) converters and explain any one of them in detail with neat sketch.

Explain multivibrators and describe the monostable multivibrator with diagrams.

Write short notes on any two of: i) De-Morgan's Theorem ii) Multiplexer and Demultiplexer iii) 7-Segment LED Display iv) Johnson Counter.