Radio frequency switching circuit
First Claim
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1. A radio frequency switching circuit, comprising:
- an FET switching circuit interposed between a first input fed with a radio frequency output from a radio frequency amplifier and a first output for supplying the radio frequency output to a subsequent stage, the FET switching circuit being turned on/off in response to a switching signal, and a second output for feeding back, to the radio frequency amplifier, a radio frequency signal having leaked to a control terminal of the FET switching circuit.
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Abstract
By using the leakage of an RF signal, transmitted power is controlled without using a signal distributor such as a directional coupler. The RF signal is leaked due to a parasitic capacitance between the source (or drain) terminal and the gate terminal of an FET constituting a transmission-side FET switching circuit of an RF switching circuit.
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Citations
15 Claims
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1. A radio frequency switching circuit, comprising:
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an FET switching circuit interposed between a first input fed with a radio frequency output from a radio frequency amplifier and a first output for supplying the radio frequency output to a subsequent stage, the FET switching circuit being turned on/off in response to a switching signal, and a second output for feeding back, to the radio frequency amplifier, a radio frequency signal having leaked to a control terminal of the FET switching circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11, 12, 13)
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8. A radio frequency switching circuit, comprising:
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an FET switching circuit interposed between a first input fed with a radio frequency output from a radio frequency amplifier and a first output for supplying the radio frequency output to a subsequent stage, the FET switching circuit being turned on/off in response to a switching signal, and a second output for feeding back, to the radio frequency amplifier, a radio frequency signal having leaked to a control terminal of the FET switching circuit, wherein the FET switching circuit comprises a through FET switching circuit including an output circuit having one end connected to the first input and the other end connected to the first output, and a shunt FET switching circuit including an output circuit connected between the first input and a reference voltage, wherein a radio frequency signal having leaked to a control terminal of the shunt FET switching circuit is fed back to the radio frequency amplifier. - View Dependent Claims (14)
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9. A radio frequency switching circuit, comprising:
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an FET switching circuit interposed between a first input fed with a radio frequency output from a radio frequency amplifier and a first output for supplying the radio frequency output to a subsequent stage, the FET switching circuit being turned on/off in response to a switching signal, and a second output for feeding back, to the radio frequency amplifier, a radio frequency signal having leaked to a control terminal of the FET switching circuit, wherein the FET switching circuit comprises a through FET switching circuit including an output circuit having one end connected to the first input and the other end connected to the first output, and a shunt FET switching circuit including an output circuit connected between the first input and a reference voltage, and the shunt FET switching circuit comprises a multistage FET including a plurality of FETs having source/drain terminals connected in series, wherein a radio frequency signal having leaked to a control terminal of the shunt FET switching circuit is fed back to the radio frequency amplifier. - View Dependent Claims (15)
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Specification