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Analog multipliers
editThere's a cute trick used to build analog multipliers. Analog multiplication is hard to implement, but analog addition, subtraction, and squaring can be done. So the relationship a * b = ((a + b)^2 - (a - b)^2) / 4 is used to build some analog multipliers from op amps and squarers. --John Nagle (talk) 05:43, 16 December 2007 (UTC)
four quadrant
editThe article could better explain four quadrant multipliers, and specifically keeping track of the sign. I believe some of the ICs mentioned are four quadrant. Gah4 (talk) 22:31, 17 April 2021 (UTC)