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, one end of the radio-frequency leakage prevention resistor being connected to a gate of the through FETs;
a control signal line commonly connected to another ends of the radio-frequency leakage prevention resistors; and
a resistor inserted in each of at least two of the control signal lines between the another end of the radio-frequency leakage prevention resistor and a control circuit supplying a control signal to the n-stage through FETs,each portion of the two control signal lines being capacitively coupled between the resistor and the another end of the radio-frequency leakage prevention resistor.
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, one end of the radio-frequency leakage prevention resistor being connected to a gate of the through FETs; a control signal line commonly connected to another ends of the radio-frequency leakage prevention resistors; and a resistor inserted in each of at least two of the control signal lines between the another end of the radio-frequency leakage prevention resistor and a control circuit supplying a control signal to the n-stage through FETs, each portion of the two control signal lines being capacitively coupled between the resistor and the another end of the radio-frequency leakage prevention resistor. - 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, one end of the through FET radio-frequency leakage prevention resistor being connected to a gate of the through FETs; a through FET control signal line commonly connected to another ends of the through FET radio-frequency leakage prevention resistors; a through FET resistor inserted in the through FET control signal line between the another end of the through FET radio-frequency leakage prevention resistor and a control circuit supplying a control signal to the n-stage through FETs; 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, one end of the shunt FET radio-frequency leakage prevention resistor being connected to a gate of the shunt FETs; a shunt FET control signal line commonly connected to another ends of the shunt FET radio-frequency leakage prevention resistors; and a shunt FET resistor inserted in the shunt FET control signal line between the another end of the shunt FET radio-frequency leakage prevention resistor and the control circuit supplying a control signal to the m-stage shunt FETs, each portion of the through FET control signal line and the shunt FET control signal line being capacitively coupled, the portion of the through FET control signal line being provided between the through FET resistor and the another end of the through FET radio-frequency leakage prevention resistor, and the portion of the shunt FET control signal line being provided between the shunt FET resistor and the another end of the shunt FET radio-frequency leakage prevention resistor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification