Traditional USB-C to 3.5mm adapters are provided for use with smartphones and other devices that do not include a 3.5mm audio jack. Such adapters have several problems that can impact user experience. Examples of the problems in current adapters include vulnerability to RF radiation interferences, desensitization of the cellular receiver in the phone, co-existence, antenna detune effect, etc.
This disclosure describes an improved design of a USB-C to 3.5mm adapter. In the design, the USB-C PCB is moved away from the device end to make it less vulnerable to the radiations from the device. The techniques further include propose use of a braided cable between the main PCB and the USB-C plug to shield from noise coupling. Signals along the wires from USB-C plug to audio jack are either power or digital and are robust in the presence of noise sources. Further, only USB signals run from USB-C plug side to the audio jack, eliminating the need to twist the microphone signal with the ground signal.
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Gu, Changzhan and Hwang, Jae-won, "USB-C to 3.5mm adapter with PCB in audio jack", Technical Disclosure Commons, (May 11, 2018)