David Viveiros Júnior, Marcos Aurélio Luqueze, Denise Consonni


This paper presents three active baluns employing MESFETs, and developed for PCN converter applications. The non-linear circuit simulator LIBRA (HP-EESOF) [1] has been used in the CAD process. The baluns were implemented in microwave techniques - hybrid (at the Laboratório de Microeletrônica, USP) and GaAs MMIC technologies ( at an external foundry [2]). Measured and simulated results are presented, isclosing an attractive degree of design flexibility: the circuits can be adjusted for broadband operation, or optimized over limited frequency range. Power linearity and DC bias can be traded off, according to specific applications. The ICs were developed at the University of São Paulo, under RD Center of Telebrás (Brazilian Telecom) coordination, the research results being property of Telebrás (contract Telebrás-USP JDPqD 586/94).

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HP-EESOF Microwave & RF Circuit Design, Series IV, version 5, Hewlett-Packard Company, 1994.

EUROPRACTICE IC Manufacturing Service, IMEC, Leuven, Belgium; GEC Marconi Materials Technology, GaAs IC Foundry, Process F20.

M.A. Luqueze, D.Consonni, D. Viveiros Jr., V.Patiri Neto; "A single GaAs MMIC for up and down conversion in PCN transceivers``, Proceedings of the "1997 IEEE MTT-S International Topical Symposium on Technologies for Wireless Applications``, Vancouver, Canada, 1997, p. 163-166.

E. Adler, E. Viveiros; "MMIC Double-Balanced Mixer``, EEsof User's Group Meeting, May 1990, Paper 4.

HP 8510 Network Analyzer, Hewlett-Packard Company.

CASCADE, Model 42 - Microwave R & D Probe Station.

NEC - CEL, California Eastern Laboratories, 4590 Patrick Henry Drive, Santa Clara, USA.


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