Array Networks for a Parallel Adder and Its Control

A collection of array-like networks of two-input AND gates is described with particular reference to their use in a parallel adder. These networks have properties which facilitate their incorporation in high-capability monolithic circuits. This leads to the adoption of a radix R and a one-in-R binary code. A decimal system is discussed and compared with a pure binary one. The application of the array networks to other digital tasks is illustrated by the design of routing circuits which enable the adder to subtract, multiply, and divide.