Combinatorial Circuits

By : Vandana Tanwar

Updated : Feb 8, 2021, 9:40

Combinatorial circuits for GATE ECE are generalized gates that reduce our work to build many gates for directing signals. It has m different inputs and n different outputs. Going by the combinatorial circuits book, you must know the various components used to make the circuit more readily usable and simple. Although combinatorial circuits may seem complex, they are built to simplify our signal channeling process. Hence it is one essential topic of the electronics engineering branch.

Combinatorial circuits GATE questions are frequent in many exams, including ESE, CAT, GATE, IES, IBPS, and ISI entrance exams. It also forms a part of various state and national level exams. Hence, you need to master the Combinatorial circuits MCQs to get good marks in this topic.

Important Combinatorial circuits Topics for GATE ECE

Combinatorial circuits syllabus for GATE has a considerable syllabus. The major topics for combinatorial circuits study material for gate ECE are given below.



Sequential Logic

It is putting logic gates in a sequential form to build a long gated channel.

Truth Table

The truth table is the chart that depicts the different inputs and their outputs using the logical connectors of the combinatorial circuit.

Sub circuits

They are an independently working circuit with a closed gate channel that works in a bigger circuit.

Tips to Solve Combinatorial circuits Questions for GATE

The following are some tips that you can follow while solving IC components questions.

  • Combinatorial circuits GATE questions and answers PDF are based on the circuit and logic gate components used in the current signaling.
  • Prepare excellent combinatorial circuit notes for the gate that contains all the details of the various logic gates. Those Combinatorial circuit gate notes will help you in revisions.
  • Practice on combinatorial circuits online quiz from online sites. These combinatorial circuits online tests help you in preparation for the real exam.
  • Be clear with the combinatorial circuits topics for GATE ECE as many topics are repetitive, such as gate sequencing and logic gate output prediction.

Importance of Combinatorial circuits in GATE ECE

Here's why the combinatorial circuit is an integral part of the GATE and other competitive exams:

  • It checks whether you can design a workable combinatorial circuit with available components. And also your grasp on the combinatorial circuits GATE syllabus.
  • The weightage of this section in the GATE exam is 2% to 5%. 
  • GATE requires you to acquire the basic knowledge of different processes involved in the fabrication of combinatorial circuits.
  • These concepts are used in real-life situations as an electronics engineer who must check the electronic systems' functions.

Most Recommended Books for Combinatorial circuits for GATE

The following are some good books of combinatorial circuits for computer science that can help you prepare for the gate's combinatorial circuits syllabus. 

Book Title


Integrated Circuit Fabrication Technology

Shiban Tiku

Digital Integrated Circuit System

Hubert Kaeslin

Handbook of Quality Integrated Circuit Manufacturing

Robert Zorich

Why Prepare Combinatorial circuits from BYJU'S Exam Prep?

Gradeup is an online education platform that provides excellent tutorials for high-level tests and entrance exams. You can get all the preparatory materials like combinatorial circuits quiz, combinatorial circuits MCQ PDF, combinatorial circuits MCQ questions, and more from BYJU'S Exam Prep. You must try your hand at answering many mock questions before going for the GATE main exam, as it will help you assess your strengths and weaknesses in this section. To prepare well for the exams, our experienced educators have designed combinatorial circuits notes for ECE, and combinatorial circuits notes for GATE ECE PDF for students that help you in the revision. 


Q. What are the basics of combinatorial circuits?

Combinatorial circuits are based on the sequential use of logic gates to deliver output from many inputs.

Q. How do the gates help in current flow?

Gates are channels through which the current can flow once any given equation is met. For example, in AND gate, both the inputs must be the same to allow the channel to open. 

Q. What is the OR gate function?

In OR gates, any one of the inputs must be true to let the channel open, and hence the output is also true.

Q. In which other exams, combinatorial circuits are asked other than GATE?

Combinatorial circuits are asked in other exams such as IES, CAT and other national level exams

Q. Why do we use combinatorial circuits?

We use combinatorial circuits to make our circuits easy and simple for use. These combinatorial circuits act as a single GATE mechanism for the whole circuit band.