Design and Characterization of Integrated Varactors for RF Applications

Varactors are passive semiconductor devices used in electronic circuits, as a voltage-controlled way of storing energy in order to boost the amount of electric charge produced. In the past, the use of low-cost fabrication processes such as complementary metal oxide semiconductor (CMOS) and silicon germanium (SiGe) were kept for integrated circuits working in frequency ranges below the GHz. Now, the increased working frequency of radio frequency integrated circuits (RF ICs) for communication devices, and the trend of system-on-chip technology, has pushed the requirements of varactors to the limit. As the frequency of RF applications continues to rise, it is essential that passive devices such as varactors are of optimum quality, making this a critical design issue.

Initially describing the physical phenomena that occur in passive devices within standard IC fabrication processes, Design and Characterization of Integrated Varactors for RF Applications goes on to:

• present information on the design of wide band electrical varactor models (up to 5 GHz) which enable the accurate prediction of device performance;
• propose a specific methodology for the measurement of integrated varactors, covering on-wafer measurement structures, the calibration process, and detailed descriptions of the required equipment;
• explain de-embedding techniques and also analyse confidence level and uncertainty linked to the test set-up;
• examine the design of a voltage controlled oscillator (VCO) circuit as a practical example of the employment of methods discussed in the book.

Providing the reader with the necessary technical knowledge for dealing with challenging VCO designs, this book is an essential guide for practising RF and microwave engineers working on the design of electronic devices for integrated circuits. It is also a useful reference for postgraduate students and researchers interested in electronic design for RF applications.

Dr. Íñigo Gutiérrez, Faculty of Engineering, University of Navarra (TECNUN), Paseo Manuel Lardizabal 13, 20019 San Sebastien (Guipuzcoa), Spain

Íñigo Gutiérrez is currently a Lecturer in the Engineering Faculty of the University of Navarra (TECNUN), Spain. From 2002, he has held the post of Assistant Director of the RF Area of TECNUN and his research interests include integrated passive filters using varactors and integrated transformers for RF applications. Whilst at the University, Dr Gutiérrez has participated in several research projects involving varactors for industry and the Basque Government. He has also authored 4 technical publications and made 8 contributions to international congresses.

Dr. Juan Meléndez, Faculty of Engineering, University of Navarra (TECNUN), Paseo Manuel Lardizabal 13, 20019 San Sebastien (Guipuzcoa), Spain

Juan Meléndez is Assistant to the Director of the Communications Area of the Centro de Estudios e Investigaciones Técnicas de Guipúzcoa (CEIT), at the University of Navarra. He is also Assistant Professor in the Laboratory of Components and Elecromagnetic Compatibility at TECNUN. Since joining the CEIT, he has been Leader on a number of projects for international companies, developing wireless systems for domestic applications and implementing Six-Sigma methodology for the development and characterization of Wireless LAN applications in SiGe and CMOS. His research interests include system design level of RF transceivers. He is a member of the IEEE and has authored four technical publications.

Dr. Erik Hernández, Faculty of Engineering, University of Navarra (TECNUN), Paseo Manuel Lardizabal 13, 20019 San Sebastien (Guipuzcoa), Spain

Erik Hernández is currently a Researcher in the Communications Area of the Centro de Estudios e Investigaciones Técnicas de Guipúzcoa (CEIT), at the University of Navarra. He is also Assistant Professor in the Laboratory of Components TECNUN. Since joining the CEIT, he has been Leader for the project ‘Passive Radiofrequency Link for ISM Bands’ and has worked on different research initiatives for the company IKUSI. He has authored seven technical publications and has made 10 contributions to international congresses.