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MMIC differential amplifier implementation based on RF&MW analytical tools

Differential amplifier DA is one of the most important circuits used in the design of modern electronic systems; its high frequency MMIC implementation looks very promising for the integration of active and complex functions at high frequencies. Active components as phase splitters, balanced mixers, multipliers, filters, and power splitters are among other circuits that can be implemented with MMIC DA. However high frequency DA CMRR limitation is one of the major issues that prevent DA high frequency implementation. This paper shows a DA MMIC analysis and implementation based on high frequency analytical techniques. The results obtained in this work show how a typical DA CMRR can be improved when the coupling impedance is well designed at high frequencies.