H - Electricity – 03 – H
Patent
H - Electricity
03
H
H03H 11/12 (2006.01)
Patent
CA 2044501
ABSTRACT An electrical signal filter composed of a pair of cascaded filter sections in which the group delays of the two filter sections are matched so that their non linear effects cancel in the passband, resulting in an overall linear phase. In addition, the attenuation slope after the first null in one filter section's stopband response is complemented by the other filter's stopband attenuation. This prevents the overall stopband attenuation from falling to extremely low values as with some filters, which, in turn, limits the time domain overshoot. The passband group delay and stopband attenuation characteristics are controlled by appropriate selection of the passband ripple and filter order number parameters of the filter. In a preferred embodiment, the two filter sections are of the elliptic and Chebyschev type. The invention can be implemented as analog-component active filter circuit or as a digital filter.
Braathen Russell
Novatel Communications Ltd.
Smart & Biggar
LandOfFree
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