Lec-14 : Adders & Subtractors Deep Dive | Half & Full Adder/Subtractor | Digital Logic GATE |
Welcome to Lecture 14 of the Digital Logic for GATE 2025 series!
In this session, we dive deep into the complete concept of Adders and Subtractors – essential building blocks in Digital Electronics.
This lecture focuses on both conceptual understanding and exam-oriented problem-solving of:
Half Adder
Full Adder
Half Subtractor
Full Subtractor
These topics frequently appear in GATE, PSUs, University Exams, and even in technical interviews related to hardware and embedded systems.
🔍 What You'll Learn in This Video:
📌 Half Adder
Concept of binary addition
Truth table, logic diagram, and circuit
Real-world significance in ALUs
📌 Full Adder
Addition with carry
Circuit design using two Half Adders
Boolean expressions and simplification
GATE-level problem-solving approach
📌 Half Subtractor
Logic behind subtraction
Difference and borrow logic
Truth table and gate-level implementation
📌 Full Subtractor
Handling borrow from previous stages
Circuit diagram, truth table, and expression
Comparison with Full Adder logic
Common mistakes and tricks to avoid
🎯 Why This Lecture is Important for GATE 2025:
✔️ Core topic under Combinational Circuits
✔️ Very high chance of 1–2 direct questions in GATE
✔️ Builds base for future topics like ALU Design, Carry Lookahead Adder, and Sequential Circuits
✔️ Includes GATE Previous Year Questions (PYQs), tricks, and visual diagrams
🧠 Who Should Watch This?
GATE 2025 CSE/ECE/EE Aspirants
B.Tech/BE Students (2nd or 3rd year)
PSU Exam Aspirants: ISRO, DRDO, BARC, BEL
Students preparing for technical placements & interviews
Anyone revising Digital Logic fundamentals
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