Compact three-terminal structures with integrated matching and balun functionality are presented. The structures are in the form of tapped Marchand baluns and possess prescribed immittance profiles at either their single-ended or balanced ports. These prescribed profiles are important in ensuring stability of active circuits. Tapping the balanced resonators of the baluns enables the realization of an extremely wide range of load-to-source impedance or admittance ratios at no increase in overall size. Designs and implementations of two tapped Marchand baluns with octave bandwidths centered at 500 MHz are presented
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Fathelbab et al. (2006) studied this question.
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