| 摘要 |
A composite filter ( 200 ) includes at least two cascading filters ( 202, 204 ) designed to minimize a passband ripple in the composite filter ( 200 ). The at least two cascading filters ( 202, 204 ) may also be designed to maximize stopband rejection in the composite filter ( 200 ). Filter characteristics, such as the order, bandwidth, stopband attenuation, and ripple magnitude, for the cascading filters ( 202, 204 ) are selected in order to achieve minimal passband ripple and maximum stopband rejection in the composite filter ( 200 ). The passband ripple in the composite filter ( 200 ) is minimized or cancelled by having the passband ripple in the cascading filters ( 202, 204 ) be equal or nearly equal in magnitude but out of phase with respect to each other.
|
