Absolute value calculating circuit having a single adder

Details Absolute value calculating circuit having a single adder Absolute value calculating circuit having a single adder

G - Physics

06

F

354/204

G06F 7/544 (2006.01) G06F 7/50 (2006.01)

Patent

CA 1301937

ABSTRACT OF THE DISCLOSURE An absolute value calculating circuit produces an absolute value of a difference between a first and a second numerical value which have a predetermined bit length and are represented by 2's complement notation. The circuit comprises first inverting means for inverting the first numerical value to output an inverted numerical value, first adding means for adding the second numerical value to the inverted numerical value to output an addition result, second inverting means for inverting the addition result to output a first calculation result and second adding means for adding 1 to the addition result to output a second calculation result. Selecting means select and deliver as an absolute value of a difference either one of the first and second calculation results by referencing a sign of the addition result.

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