On-die radio frequency directional coupler
First Claim
Patent Images
1. A directional coupler, comprising:
- an input port;
an output port;
a coupled port;
a ballasting port;
a first transmission element having a first connection to the input port and a second connection to the output port;
a second transmission element having a first connection to the coupled port and a second connection to the ballasting port;
a first compensation capacitor connected to the input port and the coupled port;
a second compensation capacitor connected to the input port and the ballasting port; and
a third compensation capacitor connected to the coupled port and the ballasting port;
wherein the first transmission element and the second transmission element are inductors, the first transmission element being inductively coupled to the second transmission element by a predefined coupling factor, the coupled port being isolated from the input port by a predefined first isolation factor, and the ballasting port being isolated from the input port by a predefined second isolation factor.
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Abstract
A directional coupler with increased directivity is disclosed. There is an input port, an output port, a coupled port, and a ballasting port. A first transmission element has a first connection to the input port and a second connection to the output port, and a second transmission element has a first connection to the coupled port and a second connection to the ballasting port. A first compensation capacitor is connected to the input port and the coupled port, and a second compensation capacitor is connected to the input port and the ballasting port.
35 Citations
24 Claims
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1. A directional coupler, comprising:
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an input port; an output port; a coupled port; a ballasting port; a first transmission element having a first connection to the input port and a second connection to the output port; a second transmission element having a first connection to the coupled port and a second connection to the ballasting port; a first compensation capacitor connected to the input port and the coupled port; a second compensation capacitor connected to the input port and the ballasting port; and a third compensation capacitor connected to the coupled port and the ballasting port; wherein the first transmission element and the second transmission element are inductors, the first transmission element being inductively coupled to the second transmission element by a predefined coupling factor, the coupled port being isolated from the input port by a predefined first isolation factor, and the ballasting port being isolated from the input port by a predefined second isolation factor.
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2. A directional coupler, comprising:
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an input port; an output port; a coupled port; a ballasting port; a first transmission element having a first connection to the input port and a second connection to the output port; a second transmission element having a first connection to the coupled port and a second connection to the ballasting port; a first compensation capacitor connected to the input port and the coupled port; and a second compensation capacitor connected to the input port and the ballasting port; wherein the first transmission element and the second transmission element are inductors, the first transmission element being inductively coupled to the second transmission element by a predefined coupling factor, the coupled port being isolated from the input port by a predefined first isolation factor, and the ballasting port being isolated from the input port by a predefined second isolation factor; wherein a first directivity defined by the predefined coupling factor and the first isolation factor is different from a second directivity defined by the predefined coupling factor and the second isolation factor. - View Dependent Claims (3, 4)
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5. A directional coupler, comprising:
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an input port; an output port; a coupled port; a ballasting port; a first transmission element having a first connection to the input port and a second connection to the output port; a second transmission element having a first connection to the coupled port and a second connection to the ballasting port; a first compensation capacitor connected to the input port and the coupled port; a second compensation capacitor connected to the input port and the ballasting port; and a dielectric layer; wherein the first transmission element and the second transmission element are inductors, the first transmission element being inductively coupled to the second transmission element by a predefined coupling factor, the coupled port being isolated from the input port by a predefined first isolation factor, and the ballasting port being isolated from the input port by a predefined second isolation factor; wherein the first transmission element is a spiral conductive trace disposed on the dielectric layer and being defined by an outer terminus, a plurality of successively inward turns, and an inner terminus, and the second transmission element is second spiral conductive trace disposed on the dielectric layer and in a spaced coplanar relationship with the first conductive trace and inductively coupled thereto, the second spiral conductive trace being defined by an outer terminus, a plurality of successively inward turns, and an inner terminus. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A directional coupler, comprising:
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an input port; an output port; a coupled port; a ballasting port; a dielectric layer; a first spiral conductive trace disposed on the dielectric layer, the first spiral conductive trace having a first predefined width and a first predefined thickness, and being defined by a outer terminus, a plurality of successively inward turns, and an inner terminus; a second spiral conductive trace disposed on the dielectric layer and in an interlocking, spaced coplanar relationship with the first conductive trace and inductively coupled thereto, the second spiral conductive trace having a second predefined width and a second predefined thickness, and being defined by an outer terminus, a plurality of successively inward turns, and an inner terminus; a first underpath formed on the dielectric layer connecting the inner terminus of the second spiral conductive trace to the ballasting port, the first underpath being capacitively coupled to at least one of the first spiral conductive trace and the second spiral conductive trace; and a second underpath formed on the dielectric layer connecting the inner terminus of the first spiral conductive trace to the output port, the second underpath being capacitively coupled to at least one of the first spiral conductive trace and the second spiral conductive trace. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification