A Broadband Quadrature-Modulator with Integrated Baluns

A broadband direct-conversion quadrature-modulator has been implemented in 0.8 m SiGe with integrated baluns in its RF-signal paths. Measured performance includes IRR-values at better than –40 dBc in 0.75–3.6 GHz with output power levels in excess of –20 dBm. For this performance circuit draws 46 mA from a single 2.5 V supply.Esa Tiiliharju was born in Rovaniemi, Finland, in 1966. He received the M.Sc. degree in Information Technology in 1995, and the Lic.Tech degree in electrical engineering in 1998, both from Helsinki University of Technology, Finland.From 1996 to July 1997 he was employed as assistant at Helsinki University of Technology. He has been holding a position of a research assistant from 1997, and he is currently working towards the Ph.D. degree in the Electronic Circuit Design Laboratory at Helsinki University of Technology.His research interests include the design of integrated low-power circuits for portable telecommunication applications. He has designed and measured several integrated circuits for this application area. He is author or co-author for several international refereed conference and journal publications on analog integrated circuits.Kari A.I. Halonen was born in Helsinki, Finland, on May 23, 1958. He received the M.Sc. degree in electrical engineering from the Helsinki University of Technology (HUT) in 1982 and the Ph.D. degree in electrical engineering from the Katholieke Universiteit Leuven, Heverlee, Belgium, in 1987.From 1982 to 1984, he was with HUT as an Assistant and with the Technical Research Center of Finland as a Research Assistant. From 1984 to 1987, he was a Research Assistant with the E.S.A.T. Laboratory, Katholieke Universiteit Leuven, with a temporary grant from the Academy of Finland. Since 1988, he has been with the Electronic Circuit Design Laboratory, HUT, as a Senior Assistant from 1988 to 1990, and as the Director of the Integrated Circuit Design Unit of the Microelectronics Center from 1990 to 1993. He was on leave of absence during the academic year 1992–1993, acting as Research and Development Manager with Fincitec Inc., Finland. From 1993 to 1996, he was an Associate Professor, and since 1997, he has been a full Professor with the Faculty of Electrical Engineering and Telecommunications, HUT. He became the Head of Electronic Circuit Design Laboratory year 1998. He was the Technical Program Committee Chairman for the European Solid-State Circuits Conference in 2000. He is the author or coauthor of over 150 international and national conference and journal publications on analog integrated circuits, and holds several patents on analog integrated circuits. His research interests are in CMOS and BiCMOS analog integrated circuits, particularly for telecommunication applications.Dr. Halonen was an Associate Editor of the IEEE Transactions on Circuits and Systems–Part I: Fundamental Theory and Applications from 1997 to 1999. He has been a Guest Editor for the IEEE Journal of Solid-State Circuits. He received the BeatriceWinner Award from the IEEE International Solid-State Circuits Conference in 2002.