Title :
Tunable IF Filter using Thin-Film BST Varactors
Author :
Sanderson, Glenn ; Cardona, Albert H. ; Watson, Thomas C. ; Chase, David ; Roy, Manas ; Paricka, Joseph M. ; York, Robert A.
Author_Institution :
Agile Mater. & Technol. Inc., Goleta
Abstract :
This paper describes the design and characterization of a lumped-element tunable IF filter using thin-film barium strontium titanate (BST) varactors. The filter was designed to operate from 30-88MHz in three separate switch-selectable bands with a 0-12V DC control voltage. A relatively constant insertion loss of <5dB was obtained over the desired tuning range. The circuit was also characterized over temperature from -40degC to +80degC, showing relatively little change in insertion loss over temperature, but a slight reduction in tuning range at elevated temperatures.
Keywords :
VHF filters; band-pass filters; barium compounds; circuit tuning; lumped parameter networks; strontium compounds; thin film capacitors; varactors; (BaSr)TiO3; DC control voltage; bandpass filter; barium strontium titanate; frequency 30 MHz to 88 MHz; insertion loss; lumped-element filter; temperature -40 C to 80 C; thin-film BST varactors; tunable IF filter; voltage 0 V to 12 V; Barium; Binary search trees; Circuit optimization; Filters; Insertion loss; Temperature distribution; Thin film circuits; Transistors; Tunable circuits and devices; Varactors; BST; Tunable filters; tunable dielectrics; varactors;
Conference_Titel :
Microwave Symposium, 2007. IEEE/MTT-S International
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0688-9
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2007.380011
