Analog switch circuit

Disclosed in the invention is an analog switch circuit for a high-frequency signal. The analog switch circuit comprises a metal-oxide-semiconductor field-effect transistor and a control switch. The metal-oxide-semiconductor field-effect transistor consists of a drain electrode, a source electrode, a gate electrode and a polar electrode. A gate bias voltage is applied to the gate electrode to control conduction or disconnection of the metal-oxide-semiconductor field-effect transistor. The control switch consists of a control terminal, a first terminal, a second terminal and a three terminal; and the first terminal is connected to the polar electrode. A control bias voltage related to the gate bias voltage is applied to the control terminal, so that the first terminal is connected to the second terminal when the metal-oxide-semiconductor field-effect transistor is in a conduction state and the first terminal is connected to the third terminal when the metal-oxide-semiconductor field-effect transistor is turned off. The second terminal is connected to a first voltage source providing a first bias voltage; and the third terminal is connected to a second voltage source providing a second bias voltage different from the first bias voltage.