© The Institution of Electrical Engineers
The notch selectivity of a notch filter is defined as the halfpower selectivity of a feedback amplifier with an open-loop gain of 40dB and the notch filter in its feedback circuit. Parameters of the exponential, the trigonometric, and the hyperbolic RC lines for different selectivities are given.
References
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1)
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K.L. Su
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Hyperbolic RC transmission line.
Electronics Letters
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2)
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K.L. Su
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Analysis of the trigonometric RC line and some applications.
IEEE Trans.
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3)
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W.M. Kaufman ,
S.J. Garrett
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Tapered distributed filters.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19650188
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