Patent ID: 8159283

Claim:
A high frequency switch circuit having a switch circuit adapted to switch a connection state and a disconnection state of a high frequency signal path, and a control-voltage-generating circuit adapted to generate an internal control voltage for controlling the switch circuit on the basis of an external control signal, wherein the control-voltage-generating circuit includes a high-frequency-circuit-connecting terminal, an external-control-signal-input terminal, a depletion type field-effect transistor, first and second resistors, an internal-control-voltage-output terminal, a capacitor, and a diode, wherein the field-effect transistor has a grounded gate, a source connected to the external-control-signal-input terminal, and a drain connected to the internal-control-voltage-output terminal via a first node, wherein the first resistor has one terminal connected to the first node and the other terminal connected to a second node, wherein the second resistor has one terminal connected to the second node and the other terminal connected to the external-control-signal-input terminal, wherein the capacitor has one terminal connected to the high frequency signal path via the high-frequency-circuit-connecting terminal and the other terminal connected to the second node, wherein the diode has a cathode connected to the second node and an anode connected to the external-control-signal-input terminal, and wherein the internal-control-voltage-output terminal is connected to the switch circuit.