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US 9,431,812 B1Granted
Dynamic capacitors for tuning of circuits
AssigneeXilinx, Inc.
InventorJohn E. McGrath
Life of this patent
Estimating the term…
Abstract
A circuit includes a signal line formed of at least one conductive element and a shield at least partially encompassing the signal line. The circuit further includes a first dynamic capacitor located between the shield and the signal line. The first dynamic capacitor is configured to provide a first variable amount of capacitance.
Claims19
A circuit having a structure, comprising:
- a signal line formed of at least one conductive element;
- a shield at least partially encompassing the signal line, wherein the shield is positioned parallel to the signal line;
- and
- a first dynamic capacitor configured to provide a first variable amount of capacitance, wherein the first dynamic capacitor comprises:
- a first conductive element located between the signal line and the shield;
- wherein the first conductive element is positioned parallel to the signal line;
- and
- a first switch configured to couple the first conductive element to a low impedance node in a first state or decouple the first conductive element from the low impedance node and float the first conductive element in a second state responsive to a control signal, wherein the first state and the second state of the first dynamic capacitor provide different amounts of capacitance for the first variable amount of capacitance.
5 more elements
A circuit, comprising:
- a signal line formed of at least one conductive element;
- a shield at least partially encompassing the signal line, wherein the shield is positioned parallel to the signal line;
- and
- at least two dynamic capacitors located between the shield and the signal line, wherein each dynamic capacitor comprises:
- a conductive element located between the signal line and the shield and is parallel to the signal line;
- and
- a switch configured to couple the conductive element to a low impedance node in a first state or decouple the conductive element from the low impedance node and float the conductive element in a second state responsive to a control signal, wherein for each dynamic capacitor, the first state and the second state provide different amounts of capacitance for a variable amount of capacitance;
- wherein each of the at least two dynamic capacitors is not physically connected to the signal line and the conductive elements of the at least two dynamic capacitors are aligned.
5 more elements
A method of implementing a circuit, comprising:
- providing a signal line formed of at least one conductive element;
- providing a shield at least partially encompassing the signal line, wherein the shield is positioned parallel to the signal line;
- implementing a dynamic capacitor located between the shield and the signal line that is configured to provide a variable amount of capacitance, wherein the first dynamic capacitor comprises:
- a conductive element located between the signal line and the shield;
- wherein the conductive element is positioned parallel to the signal line;
- and
- a switch configured to selectively couple the conductive element to a low impedance node to provide a variable amount of capacitance;
- wherein the dynamic capacitor is not physically connected to the signal line;
- and
- varying the variable amount of capacitance provided by the dynamic capacitor by coupling the first conductive element to the low impedance node in a first state or decoupling the first conductive element from the low impedance node and floating the first conductive element in a second state responsive to a control signal, wherein the first state and the second state of the first dynamic capacitor provide different amounts of capacitance.
7 more elements
Dependencies are inferred from the claim text.