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This paper presents all current-mode operate in high precision vector summation circuit used CMOS technology 0.5 um level 3. The structure of the circuit consists of two parts: a squared and current mirror circuit. This is designed to work in all current modes which relies equations, quadratic functions. Make use fewer transistors, makes it easy to understand, but the number of transistors with high fidelity and distortion of the signal. The simulation of the circuit relies on the CMOS during saturation. With input sinusoidal input signal displayed by using the PSpice circuit analysis.

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