Apple inc. (20250069800). Radio-Frequency Transformer with Switchable Capacitor Array
Radio-Frequency Transformer with Switchable Capacitor Array
Organization Name
Inventor(s)
Haowei Jiang of San Diego CA (US)
Ming-Da Tsai of San Jose CA (US)
Frederic Bossu of Carlsbad CA (US)
Radio-Frequency Transformer with Switchable Capacitor Array
This abstract first appeared for US patent application 20250069800 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.