View source for 18454708. Radio-Frequency Transformer with Switchable Capacitor Array (Apple Inc.)

=Radio-Frequency Transformer with Switchable Capacitor Array=


==Organization Name==

[[:Category:Apple Inc.|Apple Inc.]]


[[Category:Apple Inc.]]

==Inventor(s)==

[[:Category:Haowei Jiang of San Diego CA (US)|Haowei Jiang of San Diego CA (US)]][[Category:Haowei Jiang of San Diego CA (US)]]

[[:Category:Ming-Da Tsai of San Jose CA (US)|Ming-Da Tsai of San Jose CA (US)]][[Category:Ming-Da Tsai of San Jose CA (US)]]

[[:Category:Frederic Bossu of Carlsbad CA (US)|Frederic Bossu of Carlsbad CA (US)]][[Category:Frederic Bossu of Carlsbad CA (US)]]

==Radio-Frequency Transformer with Switchable Capacitor Array==


This abstract first appeared for US patent application 18454708 titled 'Radio-Frequency Transformer with Switchable Capacitor Array

==Original Abstract Submitted==

An electronic device may include wireless circuitry having an on-chip transformer. The transformer may convey a radio-frequency signal and may include a primary coil and a secondary coil. The primary coil may have a center tap. A distributed capacitor array (DCA) may be coupled to the primary coil around the center tap. The DCA may include switchable capacitors coupled in parallel between ground and points on the primary coil on either side of the center tap. When active, each switchable capacitor contributes a different weighting to the operation of the transformer based on its distance from the center tap. A set of one or more of the switchable capacitors may be activated to contribute an asymmetric weighting to the operation of the transformer that mitigates process-related asymmetry in the transformer. This may serve to mitigate undesired common mode to direct mode signal conversion by the transformer.



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