ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,501,539, issued on Dec. 16, was assigned to SK hynix Inc. (Icheon-si, South Korea).

"Substrate including a reference voltage layer having an impedance calibrator" was invented by Jae Hoon Lee (Icheon-si, South Korea), Jong Wook Kim (Icheon-si, South Korea) and Ju Il Eom (Icheon-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "A substrate in accordance with an embodiment of the disclosure includes a signal transmission layer including a signal transmission pad and a signal transmission interconnection; a first dielectric layer stacked on the signal transmission layer; and a first reference voltage layer stacked on the first dielectric layer...