Abstract
A multistacked varactor is presented for ultra-linear tunable radio frequency applications. The varactor elements are applied in anti-series configuration and are characterized by an "exponential" C-V R relationship. Third-order intermodulation (IM3) is cancelled through proper harmonic loading of the terminals of the anti-series configuration. Multiple stacking is used to further increase the power handling and to minimize the remaining fifth-order distortion. The measured output intercept point (OIP3) at 2 GHz is > 67 dBm for modulated signals up to 10 MHz bandwidth, while providing a capacitance tuning ratio of 3:1 with an average quality factor of 40 and maximum control voltage of 10 V.
| Original language | English |
|---|---|
| Article number | 4666741 |
| Pages (from-to) | 749-751 |
| Number of pages | 3 |
| Journal | IEEE microwave and wireless components letters |
| Volume | 18 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 1 Nov 2008 |
| Externally published | Yes |
Keywords
- Adaptive systems
- Band-switching
- Impedance matching
- Low-distortion
- Tunable filters
- Tuners
- Varactors
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