Patent ID: 8994443
Filing Date: 2015-03-31
Classification: H03K

Abstract:
1. A switch circuit to be mounted in a mobile device having a shared terminal that allows insertion of a terminal of a USB cable or insertion of a terminal of a cable dedicated to the transmission of audio signals in a shared manner, comprising: a USB switch connected between the shared terminal and a USB driver within the mobile device; an audio switch connected to the shared terminal and connected in parallel with the USB switch; a second switch connected between the audio switch and a first audio circuit within the mobile device; and a third switch connected between the first audio switch and a second audio circuit within the mobile device and connected in parallel with the second switch, wherein each of the USB switch, the audio switch, the second switch, and the third switch is a bidirectional switch constructed by using a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and a source terminal and a backgate terminal of the MOSFET are connected via a transfer gate.