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Digital Electronics Interview Questions

If you are about to take an interview in any reputed electronic company, here’re the most commonly asked Digital Electronics Interview Questions and Answers. Digital electronics is a science branch which represents signals by discrete band of analog level. Most of the electronic companies ask questions from this highly complicated electronic portion. The ones, who are in search of interview questions on digital electronics, can also download such information in pdf format.

It’s not always easy to qualify such a tough interview if you are just a fresher. One should possess great knowledge about the level and type of questions while taking interview in an electronic company. To assist our readers, here’re Digital Electronics Interview Questions asked in some of the major electronic companies like TCS. This article is well organized by the team members of www.privatejobshub.in for those who are looking for digital electronics interview questions and Answers, so go through it!

Digital Electronics Interview Questions

Basic Digital Electronics Interview Questions And Answers

1. Given Only Two Xor Gates One Must Function As Buffer And Another As Inverter?
  • Tie one of xor gates input to 1 it will act as inverter.
  • Tie one of xor gates input to 0 it will act as buffer.
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3. How to achieve 180 degree exact phase shift?

To achieve 180 degree exact phase shift, you can configure DCM which is an inbuilt resource in most of FPGA. BUFGDS (inbuilt resource of most of FPGA) can also be used for the purpose.

4. What Is Significance Of Ras And Cas In Sdram?

The address command is received by SDRAM in two address words. SDRAM uses a multiplex scheme to save input pins. The first address word is latched into the DRAM chip with the row address strobe (RAS).

After the RAS, for latching the second address word the column address strobe (CAS) is used. Shortly after the RAS and CAS strobes, the stored data is suitable for reading.


5. Tell Some Of Applications Of Buffer?

Applications Of Buffer are used for various purposes. One of the most common purposes of it is to introduce small delays. It is also used to get rid of cross talk which is caused due to inter electrode capacitance due to close routing. It is used to support high fan-out too. like bufg

6. Give Two Ways Of Converting A Two Input Nand Gate To An Inverter?
  • You can do so if you short the 2 inputs of the Nand gate and apply the single input to it.
  • If you connect the output to one of the input and the other to the input signal
7. What Is A Multiplexer?

Multiplexer is a combinational circuit that selects binary information from one of many input lines and directs it to a single output line. (2n =>n), n is selection line.

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8. How Do You Detect If Two 8-bit Signals Are Same?

XOR each bits of A with B (for e.g. A [0] xor B [0]) and so on. The o/p of 8 xor gates is then given as i/p to an 8-i/p nor gate. If o/p is 1 then A=B.

9. How Will You Implement A Full Subtractor From A Full Adder?

Connect all the bits of subtrahend to the xor gate. Other input to the xor being one. The input carry bit to the full adder need to be made 1. After this, the full adder works exactly like a full subtract.

10. In A 3-bit Johnson's Counter What Are The Unused States?
  • In Johnson counter, 2(power n)-2n is the one used to find the unused states.
  • So for a 3-bit counter it is 8-6=2.Unused states=2. the two unused states are 010 and 101.

Digital Electronics Basic Interview Questions

1. Is It Possible To Reduce Clock Skew To Zero? Explain Your Answer?

2. The Circle Can Rotate Clockwise And Back. Use Minimum Hardware To Build A Circuit To Indicate The Direction Of Rotating?

3. You Have Two Counters Counting Upto 16, Built From Negedge Dff , First Circuit Is Synchronous And Second Is "ripple" (cascading), Which Circuit Has A Less Propagation Delay? Why?

4. Difference Between Synchronous And Asynchronous Reset?

5. Implement The Following Circuits:
  • 3 input NAND gate using min no of 2 input NAND Gates
  • 3 input NOR gate using min no of 2 input NOR Gates
  • 3 input XNOR gate using min no of 2 input XNOR Gates
6. Why is most interrupts active low? 

7. Difference between Mealy and Moore state machine?

8. What is difference between latch and flip-flop?

9. 7 Bit Ring Counter's Initial State Is 0100010. After How Many Clock Cycles Will It Return To The Initial State?

10. Convert D-ff Into Divide By 2. (not Latch) What Is The Max Clock Frequency The Circuit Can Handle, Given The Following Information?

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