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Higher order filters, with corresponding greater out-of-band attenuation, exhibit higher levels of group delay variations at the band edges. Group delay variation distorts signals by varying the time that the spectral components to move from the input to the output of the filter. Square waves, for instance, contain their highest frequency components at the band edges, so on a filter with a lot of group delay, the square wave will exit with rounded and otherwise distorted edges. Such distortion can (and will) negatively affect the bit error rate (BER) of digital communications.
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For
over 40 years KR Electronics has designed and manufactured high quality filters for the commercial and
military markets.
types
and individually synthesizes filters for special applications. State of the art computer synthesis, analysis
and test methods are used to meet the most challenging specifications.
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