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US 7,609,128 B2Granted
Switch circuit
AssigneeNEC Electronics Corporation
InventorHiroshi Mizutani
Life of this patent
Estimating the term…
Abstract
A branch path having a transmission line and a distributed constant line includes a resonant circuit. The resonant circuit resonates at a predetermined operating frequency when the branch path is in OFF state. At this time, the distributed constant line has a predetermined impedance. Further, an impedance of a node between the resonant circuit and distributed constant line can be set on a circle of a reflection coefficient 1 near short on the Smith chart.
Claims18
A switch circuit, comprising:
- a first branch path provided between an input terminal and a first output terminal and including a first transmission line and a first distributed constant line;
- a second branch path provided between the input terminal and a second output terminal and including a second transmission line and a second distributed constant line;
- a first resonant circuit connected between the first transmission line and the first distributed constant line to resonate at a predetermined frequency while the first branch path is in OFF state;
- and
- a second resonant circuit connected between the second transmission line and the second distributed constant line to resonate at a predetermined frequency while the second branch path is in OFF state,
- wherein
- the first distributed constant line comprises a line of field effect transistor, which determines ON or OFF state of the first distributed constant line,
- the second distributed constant line comprises a line of field effect transistor, which determines ON or OFF state of the second distributed constant line.
5 more elements
A switch circuit, comprising:
- a first branch path provided between an input terminal and a first output terminal and including a first transmission line and a first distributed constant line;
- a second branch path provided between the input terminal and a second output terminal and including a second transmission line and a second distributed constant line;
- a first resonant circuit connected between the first transmission line and the first distributed constant line to resonate at a predetermined frequency while the first branch path is in OFF state;
- and
- a second resonant circuit connected between the second transmission line and the second distributed constant line to resonate at a predetermined frequency while the second branch path is in OFF state,
- wherein
- the first distributed constant line comprises a line of diode, which determines ON or OFF state of the first distributed constant line, and
- the second distributed constant line comprises a line of diode, which determines ON or OFF state of the second distributed constant line.
5 more elements
Dependencies are inferred from the claim text.