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Reconfigurable RF active bandpass filter with BaxSr1-xTiO3 varactor.
- Source :
-
Electronics Letters (Institution of Engineering & Technology) . 1/17/2008, Vol. 44 Issue 2, p135-136. 2p. 2 Diagrams, 1 Chart, 1 Graph. - Publication Year :
- 2008
-
Abstract
- An RF tunable active bandpass filter employing a BaxSr1-xTiO3 (BST) based capacitor is proposed. This filter consists of an active capacitance circuit together with a BST tunable varactor. The active capacitor is made of a field effect transistor that exhibits negative resistance as well as capacitance. BST thin film was deposited by Sol-Gel solution and using the metal-insulator-metal capacitor process. The fabricated capacitor showed capacitance of 2.7–1.5 pF at 1.8 GHz for a maximum applied electric field of 34 V/µm. The measured second-order active bandpass filter showed bandwidth of 100 MHz, insertion loss of+0.48 dB at 1.8 GHz centre frequency and tuning frequency of 220 MHz with the application of 34 V/µm. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00135194
- Volume :
- 44
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Electronics Letters (Institution of Engineering & Technology)
- Publication Type :
- Academic Journal
- Accession number :
- 28460011
- Full Text :
- https://doi.org/10.1049/el:20082561