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A vector summation device comprises one circuit for squaring several input voltage signals, and one square root circuit with electric ground connected to the first and the second current end of the square circuit. The square circuit receives independently the first and the second current signal from the first and the second current end of the square root circuit with the current difference between the first and the second current signal is proportional to voltage square value of the input voltage signal. The square root circuit generates one output voltage signal that is proportional to current difference between the first and the second current signal.