Electronic device with increased immunity to audio noise from system ground currents

摘要

According to some aspects, an electronic device adapted to provide audio output via an audio system. The electronic device includes an audio jack adapted to be coupled to the audio system. The audio jack includes a line-out for sending audio signals to the audio system and a ground return line. The electronic device also includes a ground resistor between the ground return line and a ground node. The ground resistor has a resistance selected to reduce ground current on the ground return line when the electronic device is being charged without significantly adversely affecting the quality of the audio output.