Tunable IF Filter using Thin-Film BST Varactors

  title={Tunable IF Filter using Thin-Film BST Varactors},
  author={George Sanderson and A. H. Cardona and T. C. Watson and D. Chase and Manish Roy and J. M. Paricka and R. A. York},
  journal={2007 IEEE/MTT-S International Microwave Symposium},
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… CONTINUE READING