Any Band-Pass filter may be converted into a tunable filter with a single tuning parameter through the use of a new Tunable Heterodyne Band-Pass Filter concept in which the frequency of the heterodyne signal is adjusted thereby translating the entire filter transfer function in frequency. If the fixed filter is selected to be a narrow-band band-pass filter, the new Tunable Heterodyne Band-Pass Filter concept can be used very effectively in the elimination of narrow band interference in wide-band communications or control systems. A single-chip version of this tunable filter can be constructed using a Xilinx Virtex XCV800 chip. The resulting filter is a flexible tunable band-pass filter that can be varied from DC to n/2 or from n/2 to n depending on the parameters of the fixed output low-pass filter.

FPGA IMPLEMENTATION OF A TUNABLE BAND-PASS FILTER.pdf

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