Ulrich Rohde

Electromagnetic interference (EMI) is radiated or conducted electrical disturbances from electronic components, which can interfere with the operation of other electrical or electronic modules/systems. Electronic devices/modules typically generate undesirable electromagnetic energy, which can interfere with the operation of neighborhood devices and circuitry due to unwanted EMI transmitted through conduction and radiation. This electromagnetic (EM) energy often generates an unwanted EM field or a transient within the RF band (10 kHz - 10 GHz) of the EM spectrum and commonly referred to EMI. Such electromagnetic interference (EMI) is being known to interfere with the designated operation of the electronic circuitry of other proximate electronic devices. Modern communication systems are particularly susceptible to electromagnetic interference (EMI), which can induce the crystal oscillator circuits to oscillate at different modes and sub-harmonics. As a by-product of a normal mode of operation, start-up dynamics and stability also deteriorates under the influence of electromagnetic radiation/interference. This talk describes a novel crystal oscillator circuit using mode-coupling and phase-injection techniques for improved electromagnetic interference (EMI), start-up, and drive-level, dynamics for the realization of high frequency reference frequency standards.

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.

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

Dr. Ajay Poddar of Chief Scientist, Synergy Microwave corp., NJ 07504

Reference signal source requires highly quality factor resonating element, such as micro-machined or piezoelectric crystal that acts as an electro-mechanical resonating module in VCXO circuits. Apart from the apparent advantages of these electro-mechanical resonators they suffer from multi-mode resonance and cross talks. The selection of the desired resonance mode is challenging when the spacing between resonance modes is relatively small. This limits the fabrications of crystal oscillator as a reference sources in modern IC processes. The novel approach (mode-selection and mode-feedback techniques) reported in this paper optimizes the performance of VCXO, even those with relative low Q resonators, for low phase noise and good frequency stability. The typical measured phase noise for 155.6 MHz VCXO is typically –137 dBc/Hz at 100 Hz offset from the carrier, and to author knowledge, this is the best phase noise performance for this class of VCXO so far reported.

Biography: Dr. Ajay K. Poddar graduated from IIT Delhi, and did Ph.D. from TU-Berlin (Technical University Berlin) Germany. Dr. Poddar is a Chief Scientist at Synergy Microwave Research, Guest lecturer at Technical University Berlin. Germany, responsible for design and development of state-of-the-art technology (oscillator, synthesizers, mixer, amplifier, and filters) at Synergy Microwave Corporation NJ, USA. Previously, he worked as a Senior Scientist and a capacity of Asst. Director at Defense Research & Development Organization (DRDO), India.
Dr. Poddar received several awards for his scientific achievements, holds several dozen patents and published over 200 scientific papers in international conferences and professional journals, contributed as an author/coauthor of 4-technical books ( John Wiley & Sons).
Dr. Poddar is serving as a Academic advisory board member of Don Bosco Institute of Engineering, Bombay, India; Senior member of professional societies IEEE (USA), AMIE (India), and IE (India).

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Address:201 McLean Boulevard, , Paterson, United States, 07504

Ulrich Rohde

Biography:

Email:

Address:Cottbus, Brandenburg, Germany

Dr. Ajay Poddar of Chief Scientist, Synergy Microwave corp., NJ 07504

Biography:

Email:

Address:Paterson, United States