Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 58, Issue 6, Pages 1475-1484Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2010.2047915
Keywords
Ferroelectric capacitors; layout optimization; passive circuits
Categories
Funding
- Swedish Research Council, VR
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The extremely high permittivity of ferroelectric varactors (typically epsilon(r) >) imposes specific design and fabrication constraints for microwave and millimeter-wave applications. In this paper, small-size parallel-plate ferroelectric varactors insensitive to fabrication misalignment tolerances are studied experimentally. It is shown that the total resistance of the varactors strongly depends on the shape factor of the plates. Moreover, due to the small sizes of the varactors, the interconnecting strips become narrow and their contribution to the total resistance dominates. A simple procedure for optimization of the shape factor to minimize the varactor resistance is proposed.
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