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∞
Get Electric Circuits and Networks now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
