Tapped marchand baluns for matching applications

• Published in: IEEE transactions on microwave theory and techniques Vol. 54; no. 6; pp. 2543 - 2551
• Main Authors: Fathelbab, W.M., Steer, M.B.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-06-2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active circuits; Admittance; Applied sciences; Balancing; Baluns; Bandwidth; Circuit properties; Circuit stability; Circuits; Design. Technologies. Operation analysis. Testing; Doubly/singly terminated prototypes; Electric, optical and optoelectronic circuits; Electrical impedance; Electronic circuits; Electronics; Exact sciences and technology; Impedance matching; Integrated circuits; load-to-source immittance ratios; Marchand balun; Matching; matching networks; Microwaves; Network synthesis; Octaves; Oscillators, resonators, synthetizers; Ports; Prototypes; Radio frequency; radio-frequency integrated circuits (RFICs); Radiofrequency integrated circuits; Reflection; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal convertors; stability; Resonator; Radio wave; matching networks; Prototype; Tapping; Doubly/singly terminated prototypes; load-to- source immittance ratios; Balun; radio-frequency integrated circuits (RFICs); Radiofrequency; Implementation; Load impedance; Marchand balun; Electrical immittance; network synthesis; Integrated circuit; Radiofrequency integrated circuits; Signal converter; Circuit stability; Active circuit; stability
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2006.875821

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