Ultra linear low-loss varactor diode configurations for adaptive RF systems

Cong Huang*, Koen Buisman, Mauro Marchetti, Lis K. Nanver, Francesco Sarubbi, Miloš Popadić, Tom L.M. Scholtes, Hugo Schellevis, Lawrence E. Larson, Leo C.N. De Vreede

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)
1 Downloads (Pure)


Two linear low-loss varactor configurations for tunable RF applications are compared. The wide tone-spacing varactor stack provides the best linearity for signals with relative large tone spacing like receiver jammer situations. The narrow tone-spacing varactor stack offers the highest linearity for in-band-modulated signals, and is better suited to adaptive transmitters. Both structures make use of a varactor with an exponential C(VR) relation, and so the different requirements of transmit and receive chains can be addressed in one technology. Both configurations have been realized in a silicon-on-glass technology. The measured Q at 1.95 GHz is from ∼40 to 200 over a capacitance tuning range of 3.5 with the maximum control voltage of 12 V. The measured OIP3 of both structures are roughly 60 dBm.

Original languageEnglish
Article number4711066
Pages (from-to)205-215
Number of pages11
JournalIEEE transactions on microwave theory and techniques
Issue number1
Early online date12 Dec 2008
Publication statusPublished - 8 Jan 2009
Externally publishedYes


  • Adaptive systems
  • Band switching
  • Impedance matching
  • Low distortion
  • Tunable filters
  • Tuners
  • Varactors


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