On flex circuit desense filter for wireless communications
AssigneeApple Inc.
InventorsKasra M. Omid-Zohoor, Marc Joseph Devincentis, Paolo Sacchetto, Youchul Jeong
Life of this patent
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Abstract
An apparatus for on flex desensing, includes a flex circuit including one or more DC traces, and at least one desense filter including a transformer having a primary winding coupled to at least one of the DC traces. Each desense filter includes one or more circuits coupled to a secondary winding of the transformer. Each of the circuits includes a variable capacitor connected in parallel with a resistor, and each desense filter is tunable to filter a desense frequency in a frequency band associated with one or more wireless communication protocols.
Claims20
An apparatus comprising:
- a flex circuit including one or more conductive traces;
- and
- at least one desense filter including a transformer having a primary winding coupled to at least one of the one or more conductive traces, wherein each of the at least one desense filters further includes one or more circuits coupled to a secondary winding of the transformer, each of the one or more circuits includes a variable capacitor coupled to a resistor, and each of the at least one desense filters is tunable to filter noise at a desense frequency in a frequency band associated with one or more wireless communication protocols.
An apparatus comprising:
- a multilayer flex circuit including one or more conductive traces;
- and
- one or more desense filters, each desense filter comprising:
- a transformer having a primary winding and one or more secondary windings;
- and
- one or more circuits coupled to the one or more secondary windings,
- wherein the primary winding includes a center tap, at least one of the center tap or two terminals of the primary winding are coupled to a power source through one or two of the one or more conductive traces, each of the one or more circuits includes a variable capacitor coupled to a resistor, and each of the one or more desense filters is tunable to filter noise generated by an electromagnetic interference (EMI) noise source at a desense frequency in a frequency band associated with one or more wireless communication protocols.
A method comprising:
- implementing at least one desense filter on a flex circuit that includes one or more conductive traces coupling an electromagnetic interference (EMI) noise source to a power supply;
- and
- shielding the at least one desense filter wherein implementing a respective one of the at least one desense filter comprises:
- providing a transformer having a primary winding coupled to at least one of the one or more of the conductive traces and one or more secondary windings;
- coupling each of the one or more secondary windings to a respective circuit including a variable capacitor connected in parallel with a resistor;
- and
- tuning the respective circuit to filter noise at a desense frequency in a frequency band associated with one or more wireless communication protocols.
Dependencies are inferred from the claim text.