Cellular-array negabinary multiplier

It is shown that a particular cellular-array multiplication technique used in integrated-circuit multipliers is equivalent to the chequerboard method of John Napier, the 16th-Century mathematician. Further, a cellular-array multiplier based upon the use of `negabinary¿ numbers is developed. This is a 4-quadrant multiplier, after the style of Napier´s chequerboard, that requires no separate circuitry for sign manipulation.