This video explains the concept of Subtractor and it’s a basic logic circuit from the truth table. Also, this video explains how we realize such subtractors through adders only, using 2’s complement addition and save the area of the chip, while designing the arithmetic logic units which use the adder for both addition and subtraction.
To learn Digital Electronics in detail, please explore our online Design Methodologies course at https://elearn.maven-silicon.com/vlsi-design-course.