US 11,659,650 B2
Dual-spiral common-mode filter
Antonio Ciccomancini Scogna, Cupertino, CA (US); and Xinzhi Xing, San Jose, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Feb. 20, 2021, as Appl. No. 17/180,779.
Claims priority of provisional application 63/127,881, filed on Dec. 18, 2020.
Prior Publication US 2022/0201844 A1, Jun. 23, 2022
Int. Cl. H05K 1/02 (2006.01); H05K 1/11 (2006.01); H05K 3/46 (2006.01); H01P 3/02 (2006.01); H01P 1/203 (2006.01)
CPC H05K 1/0245 (2013.01) [H01P 1/20381 (2013.01); H01P 3/026 (2013.01); H05K 1/111 (2013.01); H05K 3/4644 (2013.01); H05K 2201/09236 (2013.01); H05K 2201/1006 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A printed circuit board, comprising:
a signal trace layer comprising:
a first signal trace comprising a first portion and a second portion, wherein the first and second portions of the first signal trace are disjoint,
a first component pad coupled to the first portion of the first signal trace,
a second component pad coupled to the second portion of the first signal trace,
a second signal trace, the second signal trace comprising a first portion and a second portion, wherein the first and second portions of the second signal trace are disjoint,
a third component pad coupled to the first portion of the second signal trace, and
a fourth component pad coupled to the second portion of the second signal trace; and
a reference plane situated under the signal trace layer, wherein the reference plane comprises a dual-spiral common-mode filter,
wherein:
a first at least part of the dual-spiral common-mode filter is situated under at least a portion of (a) the first component pad, (b) the second component pad, or (c) both (a) and (b),
a second at least part of the dual-spiral common-mode filter is situated under at least a portion of (i) the third component pad, (ii) the fourth component pad, or (iii) both (i) and (ii), and
the dual-spiral common-mode filter comprises a first spiral portion connected to a second spiral portion.