Two's complement multiplier circuit

摘要

A multiplication circuit includes a multiplying unit for multiplying a signed multiplier X represented in terms of the two's complement of n bits by a signed multiplicand Y represented in terms of two's complement of n bits to generate a signed multiplication output data of (2n-1) bits represented in terms of the two's complement, an exclusive-OR circuit for producing the exclusive-OR of the sign bits XS and YS of the respective values X and Y, and a selecting circuit for generating a sign bit "0" when the most significant bit of the multiplication output data from the multiplying unit is "0" and generating as a sign bit an output bit of the exclusive-OR circuit when the most significant bit is "1".