Digital Electronics Logic Design (EX-403) - Important Questions

Convert the following numbers between decimal, binary, octal and hexadecimal including fractional parts: (i) (3A9C.2F)16 to binary, octal and decimal (ii) (101101.101)2 to decimal, octal and hexadecimal.

Using the tabular (Quine-McCluskey) method with don't cares, find the prime implicants and obtain the minimal sum-of-products expression for F(A,B,C,D) = Sigma m(0,1,2,8,10,11,14,15) + Sigma d(5,7,9).

Implement the 4-variable Boolean function F(A,B,C,D) = Sigma m(0,1,3,4,8,9,15) using an 8:1 multiplexer with suitable selection lines and data inputs.

Explain why NAND and NOR gates are called universal gates. Realize NOT, AND, OR, XOR and XNOR gates using NAND gates only with neat diagrams.

Explain the operation of a positive edge-triggered D flip-flop with the help of circuit diagram and waveforms.

Explain the working and operation of a JK flip-flop with circuit diagram and truth table.

Draw and explain the working of a 4-bit Johnson counter with neat block diagram and timing waveforms.

Design a synchronous binary mod-8 / 4-bit counter using JK flip-flops and explain its working with timing diagram.

Explain the principle of operation and working of a successive approximation ADC with neat block diagram.

Explain what Read-Only Memory (ROM) is and describe its different types with applications.

Explain parity generators and checkers with logic diagrams. Discuss even and odd parity generation and error detection.

Explain half subtractor with truth table and logic circuit design. Extend it to show full subtractor implementation.

Explain the working principle of Master-Slave flip-flop with circuit diagram and truth table.

Explain the operation of a 4-bit bidirectional / universal shift register with parallel load using a neat diagram.

Write short notes on any two of the following: (i) Programmable Array Logic (PAL) (ii) Programmable Logic Array (PLA) (iii) Memory decoding and coincident decoding.