Apple Inc.
Methods and apparatus for reducing electromagnetic interference resultant from data transmission over a high-speed audio/visual interface

Abstract:

Methods and apparatus for reducing electromagnetic interference resultant from data transmission over a high-speed audio/visual interface. In one embodiment, an HDMI source device is disclosed. The HDMI source device includes a wireless interface and an HDMI interface coupled with an active filter circuit topology. The active filter circuit topology includes a pair of differential signal lanes; a passive filter circuit disposed within each of the pair of differential signal lanes; a plurality of active filter circuits, with at least a first active filter circuit disposed on one side of the passive filter circuit and at least a second active filter circuit disposed on the other side of the passive filter circuit; a plurality of diodes, with each of the plurality of active filter circuits coupled with a respective diode; and switching logic coupled with the plurality of diodes. Methods of operating the HDMI source device and HDMI systems are also disclosed.