Electrical Engineering › Section T · Combinational logic › Topic T.2
Half, full, ripple-carry, and look-ahead adders
A modern processor adds billions of numbers a second, and it does so with the small circuits in this topic. Adding one column of bits is easy; the real engineering lies in passing the carry along quickly.
In this topic
- Adding one column of bits
- The half adder
- The full adder
- A full adder from two half adders
- Parallel adders
- Worked example: 1011 plus 0110
- Ripple carry and its delay
- Look-ahead carry
- Worked example: look-ahead for 1011 plus 0110
- Subtraction with the same adder
- Common mistakes to avoid
- Key takeaways
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