September 2008
Beginner
834 pages
37h 13m
English
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16.11 m-DERIVED LOW-PASS FILTER SECTIONS FOR IMPROVED ATTENUATION
An m-derived LPF (Low-Pass Filter) section is a circuit section that is cascaded with the prototype section in order to improve the performance of the prototype section. More than one such m-derived section may be employed in a practical filter. Each such section results in the overall filter, providing zero gain (infinite attenuation) at a frequency above the cut-off frequency of the prototype section. We use T-sections in our discussion almost exclusively. Results for Π-Sections will be arrived at by comparison.
Consider the T-network shown in Fig. 16.11-1.
The shunt branch comprising an inductor and a capacitor will resonate at Hz. Hence, the output signal component at f∞
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