This paper describes the design and characterization of a lumped-element tunable IF filter using thinfilm barium strontium titanate (BST) varactors. The filter was designed to operate from 30-88MHz in three separate switchselectable 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 -40°C to +80°C, showing relatively little change in insertion loss over temperature, but a slight reduction in tuning range at elevated temperatures.
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