Title :
Digitally tunable bandpass filter for cognitive radio applications
Author :
Jaschke, Alexander ; Tessema, Mengistu ; Schühler, Mario ; Wansch, Rainer
Author_Institution :
Fraunhofer Inst. for Integrated Circuits, Erlangen, Germany
Abstract :
A lumped-element tunable pre-selection bandpass is presented that consists of three coupled resonators. The bandpass employs a digitally tunable capacitor (DTC) and allows for tuning of the centre frequency with a resolution of 5 bit. It covers the frequency range from 450MHz to 940 MHz, including the DVB-T band, the TV white space (TVWS) band, and the LTE-800 frequency band. The insertion-loss variation amounts to 0.3 dB. The filter measures 20mm by 20 mm, it can therefore be easily integrated into analog RF front-ends. The filter´s application to cognitive-radio platforms is discussed.
Keywords :
Long Term Evolution; band-pass filters; capacitors; cognitive radio; digital filters; resonators; DTC; DVB-T band; LTE-800 frequency band; TV white space band; TVWS band; analog RF front-ends; cognitive radio application; digitally tunable bandpass filter; digitally tunable capacitor; frequency 450 MHz to 940 MHz; gain 0.3 dB; insertion-loss variation; lumped-element tunable preselection bandpass; three coupled resonators; word length 5 bit; Bandwidth; Cognitive radio; Insertion loss; Prototypes; Radio frequency; Resonant frequency; Tuning; cognitive radio; digitally tunable capacitor (DTC); tunable bandpass filter;
Conference_Titel :
Computer Aided Modeling and Design of Communication Links and Networks (CAMAD), 2012 IEEE 17th International Workshop on
Conference_Location :
Barcelona
Print_ISBN :
978-1-4673-3123-4
Electronic_ISBN :
978-1-4673-3124-1
DOI :
10.1109/CAMAD.2012.6335363
