RADIO-FREQUENCY SWITCH CIRCUIT
First Claim
1. A radio-frequency switch circuit comprising:
- an antenna terminal;
two or more radio-frequency terminals;
n-stage through FETs (field effect transistors) connected in series between the antenna terminal and each of the radio-frequency terminals, where n is a natural number;
a radio-frequency leakage prevention resistor connected to a gate of the through FETs;
a control signal line commonly connected to the gates of the n-stage through FETs connected to the same radio-frequency terminal; and
a resistor connected to each of at least two of the control signal lines and connected to the radio-frequency leakage prevention resistor in series,the two control signal lines being capacitively coupled between the resistor and the through FETs.
1 Assignment
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Accused Products
Abstract
A radio-frequency switch circuit of the invention includes: n-stage through FETs (field effect transistors) connected in series between the antenna terminal and each of the radio-frequency terminals, where n is a natural number; a radio-frequency leakage prevention resistor connected to a gate of the through FETs; a control signal line commonly connected to the gates of the n-stage through FETs connected to the same radio-frequency terminal; and a resistor connected to each of at least two of the control signal lines and connected to the radio-frequency leakage prevention resistor in series The two control signal lines are capacitively coupled between the resistor and the through FETs.
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Citations
20 Claims
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1. A radio-frequency switch circuit comprising:
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an antenna terminal; two or more radio-frequency terminals; n-stage through FETs (field effect transistors) connected in series between the antenna terminal and each of the radio-frequency terminals, where n is a natural number; a radio-frequency leakage prevention resistor connected to a gate of the through FETs; a control signal line commonly connected to the gates of the n-stage through FETs connected to the same radio-frequency terminal; and a resistor connected to each of at least two of the control signal lines and connected to the radio-frequency leakage prevention resistor in series, the two control signal lines being capacitively coupled between the resistor and the through FETs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio-frequency switch circuit comprising:
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an antenna terminal; two or more radio-frequency terminals; n-stage through FETs (field effect transistors) connected in series between the antenna terminal and each of the radio-frequency terminals, where n is a natural number; a through FET radio-frequency leakage prevention resistor connected to a gate of the through FETs; a through FET control signal line commonly connected to the gates of the n-stage through FETs connected to the same radio-frequency terminal; a through FET resistor connected to the through FET control signal line and connected to the through FET radio-frequency leakage prevention resistor in series; m-stage shunt FETs connected in series between each of the radio-frequency terminals and the ground, where m is a natural number; a shunt FET radio-frequency leakage prevention resistor connected to a gate of the shunt FETs; a shunt FET control signal line commonly connected to the gates of the m-stage shunt FETs connected to the same radio-frequency terminal; and a shunt FET resistor connected to the shunt FET control signal line and connected to the shunt FET radio-frequency leakage prevention resistor in series, the through FET control signal line between the through FET resistor and the through FETs, and the shunt FET control signal line between the shunt FET resistor and the shunt FETs being capacitively coupled. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification