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Fully differential amplifier design in high-speed data acquisition systems

Introduction Signal integrity is paramount in high-speed data acquisition systems in applications such as communications, imaging, instrumentation, video, and multimedia; and many engineers are finding the solution to be fully differential signal processing. The advantages are inherent in the architecture: • External common-mode noise sources (from the power supply and other circuitry) are rejected by the differential nature of the architecture. • Even-order harmonics tend to cancel. • The required voltage swing for each differential output is only half that of its single-ended counterpart, thus reducing distortion and easing power-supply requirements.