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US 2018/0323778 A1Published application
Systems and methods to switch radio frequency signals for greater isolation
AssigneeSkyworks Solutions, Inc.
InventorsYu Zhu, Oleksiy Klimashov, Dylan Charles Bartle
Life of this patent
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Abstract
In semiconductor switches, the isolation can be limited by the capacitive coupling between the switch input and the switch output. Ultra-high isolation can be achieved by adding a coupled transmission line to the semiconductor switch. The coupled transmission line introduces inductive coupling, which cancels at least a part of the capacitive coupling between the switch input and the switch output.
Claims20
A switching circuit comprising:
- a coupled transmission line including a first transmission line and a second transmission line;
- and
- a plurality of transistors forming a switch and configured to switch a signal from a first port to a second port through the first transmission line and to disconnect the first port from a third port, the second transmission line inducing an inductive signal which cancels at least a portion of a capacitive signal generated by the signal capacitively coupling through the switch to the third port.
A method to improve isolation of a switching circuit, the method comprising:
- receiving a radio frequency signal at a first port in a switching circuit;
- switching the switching circuit so as to electrically connect the first port to a second port in the switching circuit and to electrically disconnect the first port from a third port in the switching circuit;
- and
- conducting the radio frequency signal from the first port to the second port through a first transmission line of a coupled transmission line.
1 more element
Dependencies are inferred from the claim text.