Radio-frequency switch circuit
First Claim
1. A radio-frequency switch circuit comprising:
- a first terminal;
two or more second terminals;
through FETs (field effect transistors) coupled in series between the first terminal and each of the second terminals;
a radio-frequency leakage prevention resistor coupled to a gate of a through FET that is coupled to one second terminal;
two control signal lines wired adjacently in parallel, comprising;
one control signal line coupled between the radio-frequency leakage prevention resistor that is coupled to the one second terminal and a control circuit that supplies a control signal to the through FETs, andanother control signal line that is coupled between the control circuit and another radio-frequency leakage prevention resistor that is coupled to a gate of another through FET that is coupled to another second terminal; and
a resistor inserted in each of the two control signal lines.
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
19 Claims
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1. A radio-frequency switch circuit comprising:
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a first terminal; two or more second terminals; through FETs (field effect transistors) coupled in series between the first terminal and each of the second terminals; a radio-frequency leakage prevention resistor coupled to a gate of a through FET that is coupled to one second terminal; two control signal lines wired adjacently in parallel, comprising; one control signal line coupled between the radio-frequency leakage prevention resistor that is coupled to the one second terminal and a control circuit that supplies a control signal to the through FETs, and another control signal line that is coupled between the control circuit and another radio-frequency leakage prevention resistor that is coupled to a gate of another through FET that is coupled to another second terminal; and a resistor inserted in each of the two control signal lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio-frequency switch circuit comprising:
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a first terminal; two or more second terminals; through FETs (field effect transistors) coupled in series between the first terminal and each of the second terminals; a radio-frequency leakage prevention resistor connected coupled to a gate of a through FET that is coupled to one second terminal; two control signal lines wired adjacently in parallel, comprising; one control signal line that is coupled to the radio-frequency leakage prevention resistor that is coupled to the one second terminal, and another control signal line that is coupled to another radio-frequency leakage prevention resistor that is coupled to a gate of another through FET that is coupled to another second terminal; a driver coupled to each of the two control signal lines; and at least one resistor coupled to at least one of the two control-signal lines and configured to be a resistance of an output of the driver.
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12. A radio-frequency switch circuit comprising:
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a first terminal; two or more second terminals; through FETs (field effect transistors) coupled in series between the first terminal and each of the second terminals; a through FET radio-frequency leakage prevention resistor coupled to a gate of a through FET of the through FETs; a through FET control signal line coupled between the through FET radio-frequency leakage prevention resistor and a control circuit supplying a control signal to the through FETs; a through FET resistor inserted in the through FET control signal line; shunt FETs coupled in series between each of the second terminals and the ground; a shunt FET radio-frequency leakage prevention resistor coupled to a gate of the shunt FETs; a shunt FET control signal line coupled between the shunt FET radio-frequency leakage prevention resistor and the control circuit supplying a control signal to the shunt FETs; and a shunt FET resistor inserted in the shunt FET control signal line, the through FET control signal line between the through FET resistor and the through FET radio-frequency leakage prevention resistor, and the shunt FET control signal line between the shunt FET resistor and the shunt FET radio-frequency leakage prevention resistor being wired adjacently in parallel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification