Arithmetic circuits such as the digital adder and subtractor are simple combinational logic. In this lab, students learn to construct a 2-bit full adder/subtractor from basic combinational logic.

We report carry and sum circuits for a 2-bit adder. The 2-bit adders are designed to be part of a pipelined 2N-bit adder-accumulator. The ICs clock at a maximum of 19 GHz and were fabricated in InAlAs ...

The full-adder circuit diagram shown in the previous page uses two XOR gates, two AND gates, and one OR gate. The circuit can be built with one 7408 AND chip, one 7432 OR chip, and one 7486 XOR chip.