US 12,016,113 B2
Mitigating PDN induced RF interference using a stepped impedance filter
Vishram Shriram Pandit, Bangalore (IN); and Yagnesh Vinodrai Waghela, Bangalore (IN)
Assigned to Intel Corporation, Santa Clara, CA (US)
Filed by Intel Corporation, Santa Clara, CA (US)
Filed on Dec. 22, 2020, as Appl. No. 17/131,501.
Prior Publication US 2022/0201842 A1, Jun. 23, 2022
Int. Cl. H01P 7/04 (2006.01); H04B 1/04 (2006.01); H04B 1/10 (2006.01); H05K 1/02 (2006.01)
CPC H05K 1/0233 (2013.01) [H04B 1/0475 (2013.01); H04B 1/1018 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power delivery apparatus comprising:
a voltage regulator circuit configured to generate a power signal;
a printed circuit board (PCB) comprising a power rail to deliver the power signal to a digital circuit; and
a filtering element configured to filter an interfering signal generated by the digital circuit, the filtering element comprising:
a first set of low impedance (low-Z) segments; and
a second set of high impedance (high-Z) segments, the low-Z and high-Z segments formed using a copper trace of the power rail and being serially connected to each other.