Patent ID: 7345521

Claim:
A high-frequency switch circuit comprising: a plurality of high-frequency switch means for passing and blocking a high-frequency signal between an input terminal and an output terminal depending on a control potential applied as a control signal: detecting means for detecting the high-frequency signal which passes though said high-frequency switch means; and a control potential generating circuit for changing the control potential applied to at least one of said plurality of high-frequency switch means in order to increase difference between the control potential applied to the high-frequency switch means which is in an ON-state and the control potential applied to a second high-frequency switch means of said plurality of high-frequency switch means which is in an OFF-state, depending on an amplitude of the high-frequency signal detected by said detecting means, said control potential generating circuit being connected between an output of said detecting means and a control input terminal of said high-frequency switch means associated with said detecting means.