Full Adder

Duration: 9 min

This video lesson is available to enrolled students.

Return to /learn/SSC-JE-IMD-SCIENTIFIC-ASSISTANT-COMPUTER-SCIENCE/part-d-cs-it/combinational-circuit/adders-subtractors/asset-full-adder after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. General Intelligence & Reasoning: Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Syllogisms, Venn Diagram, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Data Sufficiency, Puzzle Solving (Puzzles), Data Arrangement, Cubes & Dices, Calendar, Clock, Arithmetic, Number System, HCF LCM, Verbal Analogy (Word Based Analogy), Visual Recognition and Figure Completion, Paper Folding and Cutting, Transformation of Shapes, Clocks and Calendars, Direction Sense, Cubes and Dice, Patterns in Two-Dimensional Figures, Seating Arrangements, Analogy and Classification, Logical Deduction and Induction, Alphabet and Word Tests, Mathematical Operations, Series Completion, Simplification and Approximation, Coding and Decoding, Numerical Reasoning, Assembling and Grouping of Shapes, Three-Dimensional Patterns and Visualization, Vocabulary, Number System, Averages, Mixtures and Alligation, Simple and Compound Interest, Percentages, Algebra, Speed, Time and Distance, Seating and Arrangement Puzzles, Traverse Surveying, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Reading Comprehension, Critical Reasoning, Permutations and Combinations, Narrative Sequencing, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Ratio and Proportion, Time and Work, Mensuration, Data Interpretation, Powers, Surds and Logarithms, Sequences and Series, Articles and Determiners, Sentence Completion, Data Sufficiency, Blood Relations, Simple Interest and Compound Interest, Mixture and Alligation, Sequence and Series (Series), Speed Time and Distance, Algebra, Profit and Loss, Powers and Exponents (Surds and Indices), Permutation and Combination
  2. General Awareness: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, Environment, Static General Knowledge, GK- Current Affairs, Artificial Intelligence, MS Office Applications, Terms & Abbreviations, Keyboard Shortcuts, Evolution of Indian Banking (Banking & Financial Awareness), Emerging Tech Trends
  3. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus, Probability, Statistics, Signal Space and Optimum Detection, Probability, Statistics
  4. Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep, Number Systems and Codes, Registers and Counters, Boolean Algebra and Logic Gates, Microprocessors and Microcontrollers, Logic Families and CMOS Logic, Microprocessors, Logic Gates and Boolean Algebra, Minimization of Boolean Functions, Timing, Hazards and Testing, Logic Families, Combinational Logic Design, Arithmetic Circuits, Waveform Generators and Timer Circuits, Semiconductor Memories and Programmable Logic Devices, Combinational Logic Circuits, Latches and Flip-Flops, Finite State Machines, Sequential Circuits and State Machines, Minimization of Boolean Functions, Arithmetic Circuits, Latches and Flip-Flops, Number Systems and Codes, Registers and Counters
  5. Computer Organisation & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer, Register Transfer and Microoperations, Semiconductor Memories and Programmable Logic, Processor Organization and Instructions, Memory Hierarchy and Input/Output, Registers and Counters
  6. Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, HTML Basics, OOPS with C++, Java, Object Oriented Technology
  7. Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization
  8. Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  9. Theory of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  10. Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  11. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Security, Windows OS, Distributed Systems, Unix OS, Linux OS
  12. Computer Networks: Introduction to CN, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics, Data Communication, Website, Browser & Services, Web Design & Development, Network Security, Cyber Threats and Malware Attacks, Cyber Safety and Security
  13. Full Length Mock Tests:
  14. Sectional Tests:
  15. Paper 2 - Full-length Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video provides a comprehensive lecture on the Full Adder, a fundamental component in digital logic design used for arithmetic operations. It begins by defining the Full Adder as a combinational circuit that sums three input bits: two operands (A and B) and a carry-in (Cin). The instructor explains that An and Bn represent the nth order bits of numbers A and B, while Cin is the carry generated from the addition of the (n-1)th order bits. The lecture progresses to illustrate carry propagation using a 4-bit adder diagram and binary addition examples. Finally, the instructor derives the Boolean logic for the Sum and Carry Out outputs using a truth table and Karnaugh maps, concluding with the implementation of the Full Adder using basic logic gates like XOR, AND, and OR. This structured approach ensures students understand both the theoretical basis and practical circuit design of the Full Adder.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the Full Adder with on-screen text defining it as a 'combinational logic circuit that performs the arithmetic sum of three input bits.' He highlights the inputs An, Bn, and Cin, explaining that An and Bn are nth order bits while Cin is the carry from the (n-1)th order bits. He writes `( ) + ( )` on the board to visualize the addition process and labels the inputs A, B, and Cin. The text on the screen explicitly states 'It consists of three input bits, denoted by A (First operand), B (Second operand), Cin (Represents carry from the previous lower significant position).' The instructor circles the terms An and Bn in the text to emphasize their role as the current bits being added.

  2. 2:00 – 5:00 02:00-05:00

    The lecture transitions to practical examples, showing a 4-bit adder diagram with inputs A3-A0 and B3-B0, and carries C4-C0. The instructor circles specific columns to demonstrate how the carry output from one stage becomes the carry input for the next. He then displays a table of binary addition cases, such as `1+1+1` and `1+0+0`, calculating the results to show how sums and carries are generated in a multi-bit addition scenario. He writes down the binary results, for instance, writing `10` for the sum of `1+1+1` to indicate a sum of 0 and a carry of 1. This section emphasizes the concept of carry propagation where the carry obtained from the addition of two bits is added to the next higher order pair of significant bits.

  3. 5:00 – 8:31 05:00-08:31

    The instructor presents a truth table for the Full Adder with inputs A, B, Cin and outputs Sum, Cout. He uses K-maps to simplify the logic expressions, circling groups of 1s. He derives the Sum expression as `A'B'C + A'BC' + AB'C' + ABC`, which simplifies to `A XOR B XOR C`. For the Carry Out, he derives `AB + AC + BC`. The section concludes with a logic circuit diagram showing the interconnection of XOR, AND, and OR gates to implement the Full Adder. The K-maps are clearly visible with inputs labeled `ab`, `a'b'`, `a'b`, `ab`, `ab'` and `cin`, `cin'`. The final circuit diagram shows the Sum output connected to an XOR gate and the Carry output connected to an OR gate fed by three AND gates.

The video systematically builds the concept of the Full Adder from definition to implementation. It starts with the theoretical definition involving three inputs (A, B, Cin) and explains the role of carry propagation in multi-bit addition. The instructor uses visual aids like a 4-bit adder diagram and binary addition tables to clarify how carries move between bit positions. The core of the lecture involves deriving the logic equations: the Sum is the XOR of all three inputs, and the Carry Out is the majority function (AB + AC + BC). This is achieved through truth table analysis and K-map simplification. The final output is a complete logic circuit diagram, connecting the theoretical Boolean expressions to physical gate implementations, providing a full understanding of the Full Adder's structure and function. The lecture effectively bridges the gap between abstract logic definitions and concrete circuit design, ensuring students can both analyze and construct Full Adder circuits.

Loading lesson…