Designing of Full Subtractor using Half-Subtractors A Full-Subtractor can also be implemented using two half-subtractors and one OR gate. The circuit diagram for this can be drawn as, The Boolean expressions for Difference and Borrow are, ...
Full Adder using Half Adder A Full Adder can also be implemented using two half adders and one OR gate. The circuit diagram for this can be drawn as, And, it could be represented in block diagram as, The Boolean expression for Sum and Carry is as, ...
This generates SUM and C-OUT is true only when either two of three inputs are HIGH, then the C-OUT will be HIGH. So, we can implement a full adder circuit with the help of two half adder circuits. Initially, the half adder will be used to add A and B to produce a partial Sum ...