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

Convert numbers (including fractional parts) between indicated bases among binary, octal, decimal, hexadecimal, other bases and BCD

Minimize / find minimal SOP for a Boolean function using K-map method.

Design a Binary to Gray code converter combinational circuit.

Simplify Boolean function(s) using K-map and implement the result using NAND gates.

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

Simplify the Boolean expressions $Z = A + A'B + A'B'C + A'B'C'D$ and $A'B + B'C + AB' + B$ using laws and rules of Boolean algebra, stating laws used in each step.

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

Design a 4-bit BCD to Excess-3 code converter and realize it using two-level gate implementation.

What do you mean by universal Gates? How to realize AND, OR and NOT functions using universal gates only?

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

Implement a full adder circuit using a decoder (with NAND gates).

Implement basic gates / a given Boolean function using NOR gates only.

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

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

Construct an $8 \times 1$ MUX using $2 \times 1$ multiplexers.

Implement a given Boolean function using NAND gates only.

Implement a given Boolean function using a multiplexer and external logic.

Design a digital circuit which converts a 3-bit binary number into its equivalent 1's compliment form.

Draw the logic diagram of an 8-to-3 line encoder and explain its operation using truth table.

Explain the operation of a priority encoder and design and draw its logic diagram.

Design a full subtractor using required number of half subtractors.

Design a synchronous counter using JK flip-flops for a given arbitrary sequence.

Explain shift registers and their types with applications.

Explain counters and describe Johnson counter and Ring counter with timing diagrams.

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

Differentiate between serial and parallel registers with example and diagram, including what is a register.

Draw the RS flip-flop circuit and explain its operation with truth table, including applications.

Draw JK flip-flop and give its truth table, excitation table and characteristic equation.

Draw circuit diagram of Ring Counter and explain it in detail.

Convert a D flip-flop into a JK flip-flop with calculations and logic diagram using only 2-input NAND gates.

Design an asynchronous MOD-4 DOWN counter using T flip-flop.

Design and draw a Mod-6 counter using D flip-flops.

Draw the logic diagram of a universal shift register with mode controls $S_1, S_0$ for no-change, shift-right, shift-left, and parallel load.

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

Compare TTL, ECL and CMOS logic families on the basis of propagation delay, power dissipation, fan-in/fan-out and basic gate.

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

What do you understand by logic family? Give the difference between RTL and DTL logic families.

Explain how logic is generated by the TTL logic family and compare TTL with CMOS logic family.

Explain the operation of a 2-input TTL NOR gate.

Design a 2-input NOR gate using PMOS logic and explain its operation.

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

Write a short note on 7-segment LED display, including 16-segment LED display.

Explain multivibrators and describe the monostable multivibrator with diagrams.

Draw the circuit diagram of a Schmitt trigger and explain its working.

Explain the meaning of multivibrator and explain the operation of the astable multivibrator with circuit diagram.

Draw the Flash type analog to digital converter and explain its working in detail.

Explain the operation of an LCD display. What is the typical difference between an LED display and an LCD display?

Explain the operation of a Successive-Approximation type Analog-to-Digital converter.

Write short notes on any two of the following: a) Multiplexers b) Shift Registers c) LED and LCD display devices d) CMOS Logic family