// This circuit is a 4-bit ripple-carry adder with carry-out. assign sum = x+y; // Verilog addition automatically produces the carry-out bit. // Verilog quirk: Even though the value of (x+y) includes ...

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 adders are: a ripple-carry (RC) adder, a carry look-ahead (CLA) adder, and a binary carry look-ahead (BCL) adder. The RC adder has the best levels of performance for random input data, but its ...