Patent ID: 7636004

Claim:
A semiconductor device obtained by integrating, on a semiconductor substrate, a high-frequency switching device comprising a plurality of high-frequency signal input/output terminals through which high-frequency signals are input/output, and a plurality of high-frequency switch circuit sections disposed between said plurality of high-frequency signal input/output terminals, wherein each of said plurality of high-frequency switch circuit sections comprises a series connection circuit of a plurality of field-effect transistors, either a high-level voltage or a low-level voltage is applied to the gate terminals of said plurality of field-effect transistors, whereby ON and OFF states are attained, furthermore, the first terminals of resistor elements are connected to the intermediate connection points of said plurality of field-effect transistors, and a voltage, having a phase opposite to that of the voltage applied to the gate terminals of said plurality of field-effect transistors to which the first terminals of said resistor elements are connected, is applied to the second terminals of said resistor elements.