Wide-band common mode filtering apparatus

摘要

A wide-band common mode filtering apparatus includes at least two cascaded common mode filters with different noise-filtering responses, wherein the cut-off frequency of the wide-band common mode filtering apparatus is at the lowest cut-off frequency of the common mode filters, and the noise-filtering response of the wide-band common mode filtering apparatus is the superposition of the noise-filtering responses of the common mode filters. In one embodiment of the present invention, the wide-band common mode filtering apparatus includes a first common mode filter having a first filtering band, and a second common mode filter having a second filtering band different from the first filtering band. The disclosure of the present technique allows the cascaded common mode filters with different filtering bands to form the wide-band common mode filtering apparatus having an overall filtering band to meeting a new demand.

主权项

1. A wide-band common mode filtering apparatus, comprising:
at least two cascaded common mode filters with different noise-filtering responses, wherein a cut-off frequency of the wide-band common mode filtering apparatus is at a lowest cut-off frequency of the at least two common mode filters, and a noise-filtering response of the wide-band common mode filtering apparatus is a superposition of the noise-filtering responses of the at least two common mode filters; a first common mode filter having a first filtering band; and a second common mode filter having a second filtering band different from the first filtering band, wherein the first common mode filter is cascaded to the second common mode filter; wherein the first filtering band overlaps a portion of the second filtering band.