Patent ID: 6853235

Claim:
A high frequency switch comprising: a signal input terminal; first and second signal output terminals; a control terminal to which a control voltage is applied; a switch provided with: (1) a first switch element having first and second signal electrodes and a first control electrode, said signal input terminal being connected to the first signal electrode, said first signal output terminal being connected to the second signal electrode, and said control terminal being connected to any one of the first and second signal electrodes, and (2) a second switch element having third and fourth signal electrodes and a second control electrode, said signal input terminal being connected to the third signal electrode, said second signal output terminal being connected to the fourth signal electrode, and said control terminal being connected to the second control electrode; and a reference voltage generation circuit that generates first and second reference voltages, the values of which are different from each other, provides said first reference voltage to the first control electrode, and provides said second reference voltage to any one of the third and fourth signal electrodes of said second switch element, wherein: on the basis of the relation between said control voltage and said first reference voltage and the relation between said control voltage and said second reference voltage, depending on the value of the control voltage, said first and second switch elements are selectively made conductive, said first switch element is composed of a first field effect transistor in which any one of the source electrode and the drain electrode serves as said first signal electrode, the other one of the source electrode and the drain electrode serves as said second signal electrode, and the gate electrode serves as said first control electrode, said second switch element is composed of a second field effect transistor in which any one of the source electrode and the drain electrode serves as said third signal electrode, the other one of the source electrode and the drain electrode serves as said fourth signal electrode, and the gate electrode serves as said second control electrode, and the difference between said first reference voltage and said second reference voltage equals approximately to the threshold value of said first and second field effect transistors.