US 12,295,102 B1
Far field interference cancellation for resistive-inductive-capacitive sensors
Zhong You, Austin, TX (US); Emmanuel Marchais, Dripping Springs, TX (US); Robert G. Kratsas, Austin, TX (US); and Anthony S. Doy, Los Gatos, CA (US)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Mar. 12, 2019, as Appl. No. 16/299,648.
Claims priority of provisional application 62/739,970, filed on Oct. 2, 2018.
Claims priority of provisional application 62/721,134, filed on Aug. 22, 2018.
Claims priority of provisional application 62/649,857, filed on Mar. 29, 2018.
Claims priority of provisional application 62/649,870, filed on Mar. 29, 2018.
Int. Cl. H05K 1/16 (2006.01); G01N 27/02 (2006.01); G01R 27/26 (2006.01); H01F 5/00 (2006.01); H03M 1/18 (2006.01)
CPC H05K 1/16 (2013.01) [G01N 27/023 (2013.01); G01R 27/26 (2013.01); H01F 5/003 (2013.01); H03M 1/181 (2013.01); H05K 2201/10151 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An apparatus for use in inductive-based sensing comprising:
an inductor comprising:
a plurality of inductor coils comprising a plurality of first inductor coils and a plurality of second inductor coils, each inductor coil comprising a spiraling wire of electrically-conductive material wherein the wire of electrically-conductive material is arranged substantially in a plane;
wherein the plurality of first inductor coils and the plurality of second inductor coils are electrically coupled to one another and arranged with respect to one another such that:
within the plane, electrical current flowing through the inductor flows clockwise in the first inductor coils;
within the plane, electrical current flowing through the inductor flows counterclockwise in the second inductor coils;
each first inductor coil is adjacent to at least one second inductor coil; and
each second inductor coil is adjacent to at least one first inductor coil; and
one or more mechanical members, arranged proximate to a respective one of the plurality of inductor coils such that displacement of the one or more mechanical members resulting from an occurrence of a physical interaction associated with a human-machine interface associated with the one or more mechanical members causes a change in an effective impedance of the inductor.