Band-Pass/Band-Stop Filter Design by Frequency Transformation
Given the specifications of a band-pass filter (BPF) or a band-stop filter (BSF), the same can be translated to those of a normalized low-pass filter (LPF) by frequency transformation. Once the latter is designed, one can realize the BPF/BSF by using the same transformation in a reverse manner. The process of translation to the normalized LPF is usually not explained in details in standard textbooks, and in some of them, the process has even been wrongly stated or illustrated. This chapter clarifies this important step in BPF/BSF design.
KeywordsBand-Pass Band-Stop Frequency transformation
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