Patent ID: 9294598
Filing Date: 2016-03-22
CPC Classification: H03K,H04M

Claim Text:
1. A switch circuit to be mounted in a device having a common terminal which allows insertion of a terminal of a cable for transmitting high-frequency signals and insertion of a terminal of a cable dedicated to the transmission of audio signals, the switch circuit comprising: a high-frequency signal switch capable of switching between passage and no passage of high-frequency signals, wherein the high-frequency signal switch comprises a pair of series connected MOSFETs; and a bidirectional audio signal switch dedicated to switching between passage and no passage of audio signals, wherein the bidirectional audio signal switch comprises a pair of series connected MOSFETs, wherein a signal line from the common terminal is branched into one line connected to one end of said high-frequency signal switch and another line connected to one end of an audio signal switch in a primary hierarchical position, wherein a signal line from the other end of said high-frequency signal switch is connected to a target circuit, and wherein a signal line from the other end of the audio signal switch in the primary hierarchical position is branched into a plurality of lines, the respective plurality of lines are connected to one end of a plurality of audio signal switches in a secondary hierarchical position, the respective signal lines from the other end of the plurality of audio signal switches in the secondary hierarchical position are connected to respective target circuits, the high-frequency signal switch is of a first type having a center potential that is clamped to a supply voltage when the high-frequency signal switch is in an off state and not allowing passage of the high-frequency signals and disconnected from the supply voltage when in the high-frequency signal switch is in an on state and allowing passage of the high-frequency signals, and wherein the audio signal switch is of a second type having a center potential than is clamped to a ground when in an off state and disconnected from ground when in an on state and allowing passage of the audio signals.