Abstract
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 language | English |
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Article number | 4711066 |
Pages (from-to) | 205-215 |
Number of pages | 11 |
Journal | IEEE transactions on microwave theory and techniques |
Volume | 57 |
Issue number | 1 |
Early online date | 12 Dec 2008 |
DOIs | |
Publication status | Published - 8 Jan 2009 |
Externally published | Yes |
Keywords
- Adaptive systems
- Band switching
- Impedance matching
- Low distortion
- Tunable filters
- Tuners
- Varactors