Ulrich Rohde

One of the critical building blocks of a multi-mode trans-receiver system is a configurable multi-band voltage controlled oscillators (VCOs) that are required for both up and down conversion. Mobile phones and radios operating in several modes are typically switch between receiving frequencies and transmitting frequencies, and therefore, require reconfigurable oscillator in each of the switched bands.A general problem in the VCO design is a trade-off between tuning range, phase noise and power consumption. The simplified approach for wideband VCO is a switched capacitor network for coarse tuning and a tuning varactor for fine-tuning, as shown in Figure (1). Such an arrangement can offer wideband tunability but at the cost of poor phase noise and power-consumptions. Another option is set of parallel VCOs that can cover several frequency ranges. The advantage of this approach is now each VCO can be tailored for best phase noise, power consumption, and tuning range trade-off. The main drawback of multiple VCOs solutions is a significantly increased die area, therefore, not a cost-effective alternative. To overcome the above problems, we propose a reconfigurable architecture using active tunable inductors (ATI) that synchronously generates multiple frequencies for different bands without using multiplier and switching, therefore, cost-effective and power-efficient solutions

Biography: Prof. Dr.-Ing. habil. Dr. h.c. mult. Ulrich L. Rohde is a Chairman of Synergy Microwave Corp., Paterson, New Jersey; President of Communications Consulting Corporation, serving as an honorary member of the Senate of the Department of Defense University Munich ,honorary member of the Senate of the Brandenburg University of Technology Cottbus–Senftenberg , Germany; past member of the Board of Directors of Ansoft Corporation, Pittsburgh, Pennsylvania; and is a partner of Rohde & Schwarz, Munich, Germany. Prior to being appointed Honorary Professor of RF and Microwave Technologies at the University of Cottbus, Dr. Rohde was appointed Visiting Professor of RF and Microwave Technologies in November 2001 at the University of Cottbus, Germany, was member of the staff at George Washington University (1982) and as an adjunct professor at the University of Florida, Gainesville, teaching in the Electrical Engineering and Computer Sciences departments gave numerous lectures worldwide regarding communications theory and digital frequency synthesizers.He is also a full professor at the university of Oradea. Dr. Rohde has published more than 300 scientific papers in professional journals and several books and book chapters, and several dozen patents. Dr. Rohde is a member of the following: Fellow Member of the IEEE, Member of the IEEE Technical Committee for HF, VHF, and UHF Technology MTT-17, Member of the IEEE Signal Generation and Frequency Conversion MTT-22, Invited Panel Member for the FCC’s Spectrum Policy Task Force on Issues Related to the Commission’s Spectrum Policies, ETA KAPPA NU Honor Society, Executive Association of the Graduate School of Business-Columbia University, New York, The Armed Forces Communications & Electronics Association, Fellow of the Radio Club of America, and former Chairman of the Electrical and Computer Engineering Advisory Board at New Jersey Institute of Technology.

Email:

Address:Brandenburgische Technische Universitat, BTU Cottbus, Cottbus, Brandenburg, Germany, 03013

Ulrich Rohde

Biography:

Email:

Address:Cottbus, Brandenburg, Germany