This post is part of the series 12th Standard Digital Electronics Topics
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In this post I am presenting the lecture on “Understanding the Full Adder circuit using animated circuit“. The full adder circuit using logic gates is a combination of basic logic gates. It uses two half adder circuits connected one after another, as shown below. Using this circuit, we can add three binary digits at a time.
In full adder, there are three inputs A,B,C – where A is at MSB and C is at LSB position. There are two outputs SUM and CARRY – SUM is at MSB and CARRY is at LSB.
The outputs of first half adder are CARRY-1 and SUM-1. The output SUM-1 is connected to one input of next half adder. Its SUM output is taken as independent output. The CARRY-1 and CARRY-2 outputs of both half adders are ORed together to form a single CARRY output.
The 8 combinations (Click to enlarge)
Note: Green indicates logic-0 and Red indicates logic-1 levels in all the following circuits.
Watch Video Lecture on Full Adder
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Basic tutorials De Morgan Theorems