High frequency switch circuit comprising a transistor on the high frequency path
First Claim
1. 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, andwherein the internal-control-voltage-output terminal is connected to the switch circuit.
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Accused Products
Abstract
A high frequency switch circuit according to the present invention includes a control-voltage-generating circuit. The control-voltage-generating circuit includes a depletion type field-effect transistor, an external-control-signal-input terminal, an internal-control-voltage-output terminal, and a power-receiving terminal of the control-voltage-generating circuit. The field-effect transistor has a grounded gate, a source connected to the external-control-signal-input terminal, and a drain connected to the power-receiving terminal. The internal-control-voltage-output terminal is connected to an electrical connection path between the drain of the field-effect transistor and the power-receiving terminal.
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Citations
12 Claims
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1. 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.
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7. 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 comprises a high-frequency-circuit-connecting terminal, an external-control-signal-input terminal, a depletion type field-effect transistor, a first resistor, 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 a second node, wherein the diode has a cathode connected to the second node and an anode connected to a first node, wherein the first resistor has one terminal connected to an electrical connection path between the first node and the internal-control-voltage-output terminal, 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 first node, and wherein the internal-control-voltage-output terminal is connected to the switch circuit.
Specification