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

fYear

2007

fDate

3-8 June 2007

Firstpage

679

Lastpage

682

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium, 2007. IEEE/MTT-S International

Conference_Location

Honolulu, HI

ISSN

0149-645X

Print_ISBN

1-4244-0688-9

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2007.380011

Filename

4263908