Building an 8-bit Adder from Two 4-bit Adders

For our purposes, it will be sufficient to focus only on the Carry-Ripple Adder. It is interesting that in a 4-bit adder, four full adders are used. However, for addition, it would be sufficient to use one half adder and three full adders. An advantage is that this allows us to build an 8-bit adder from two 4-bit adders.

Task

In CircuitVerse, you can find a ready-made adder under “Misc”. Under “Properties,” you can configure this as a 4-bit adder.

Use two 4-bit adders to build an 8-bit adder.