September 2008
Beginner
834 pages
37h 13m
English
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16.13 CONSTANT-k AND m-DERIVED HIGH-PASS FILTERS
Constant-k T-section and Π-Section prototype filter circuits are shown in Fig. 16.13-1.
Consider the T-section filter. The first capacitor presents high impedance at low frequency, while the inductor presents low impedance. This results in considerable attenuation of the signal at the inductor node. The filter is usually terminated at a load resistance. The high impedance of the second capacitor (high compared to load resistance) further chokes even the little voltage developed at that point at low frequencies. Thus, the signal appearing across the output is a doubly attenuated version and is quite small at low frequencies.
The capacitors go short and the inductor goes open at high frequencies, ...
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