Apparatus and method for implementing a differential drive amplifier and a coil arrangement
First Claim
1. An apparatus for reducing an amplifier output noise, comprising:
- a switching device having a conductive state and configured to receive a drive signal, the switching device coupled to a first output node and a second output node, the conductive state altered based on the drive signal to produce a first output signal having a first current value at the first output node and a second output signal having a second current value at the second output node, the first and second current values substantially equal in magnitude; and
a first coil driven by the first output node; and
a second coil driven by the second output node, the first coil and the second coil configured to wirelessly output power at a level sufficient to power or charge a receiver device.
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Accused Products
Abstract
Exemplary embodiments are directed to differentially driving a load. An apparatus includes a differential drive amplifier including a switching device coupled with a first output node and a second output node. The first output node and the second output node drive a load network including primary coils. The differential drive amplifier also includes a drive circuit configured to drive the switching device. The drive circuit may be configured to provide a drive signal to the switching device to alter a conductive state of the switching device to produce a first output signal at the first output node and a second output signal at the second output node. The first and second output signals may be substantially equal in magnitude but opposite in polarity relative to a reference voltage.
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Citations
45 Claims
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1. An apparatus for reducing an amplifier output noise, comprising:
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a switching device having a conductive state and configured to receive a drive signal, the switching device coupled to a first output node and a second output node, the conductive state altered based on the drive signal to produce a first output signal having a first current value at the first output node and a second output signal having a second current value at the second output node, the first and second current values substantially equal in magnitude; and a first coil driven by the first output node; and a second coil driven by the second output node, the first coil and the second coil configured to wirelessly output power at a level sufficient to power or charge a receiver device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 22, 25)
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11. A method for reducing an amplifier output noise, comprising:
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receiving a drive signal from a drive circuit at a switching device; altering a conductive state of the switching device based on the drive signal to produce a first output signal having a first current value at a first output node and a second output signal having a second current value at a second output node, the first and second current values being substantially equal in magnitude; and driving a first coil with the first output signal by the first output node and a second coil with the second output signal by the second output node; and wirelessly outputting power by the first coil and the second coil at a level sufficient to power or charge a receiver device. - View Dependent Claims (16, 17, 18, 23, 26, 27, 28, 29, 30, 31, 32, 33)
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12. An apparatus for reducing an amplifier output noise, comprising:
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means for receiving a drive signal from a drive circuit at a switching device; means for altering a conductive state of the switching device based on the drive signal to produce a first output signal having a first current value at a first output node and a second output signal having a second current value at a second output node, the first and second current values being substantially equal in magnitude; and means for driving a first coil with the first output signal by the first output node and a second coil with the second output signal by the second output node, the first coil and the second coil configured to wirelessly output power at a level sufficient to power or charge a receiver device. - View Dependent Claims (19, 20, 21, 24, 34, 35, 36, 37, 38, 39, 40, 41)
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13. An apparatus for powering or charging a device, comprising:
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a first coil driven by a first signal having a first current value; and a second coil driven by a second signal having a second current value, the first and second current values being substantially equal in magnitude, the first coil and the second coil having a spiral configuration within a common plane that provides for co-location of substantially equal and opposite voltages within the first and second coils, respectively, at substantially any location on the common plane, the first coil and the second coil configured to wirelessly output power at a level sufficient to power or charge a receiver device. - View Dependent Claims (14)
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42. A method for powering or charging a device, comprising:
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driving a first coil by a first signal having a first current value; and driving a second coil by a second signal having a second current value, the first and second current values being substantially equal in magnitude, the first coil and the second coil having a spiral configuration within a common plane that provides for co-location of substantially equal and opposite voltages within the first and second coils, respectively, at substantially any location on the common plane, the first coil and the second coil configured to wirelessly output power at a level sufficient to power or charge a receiver device. - View Dependent Claims (43)
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44. An apparatus for powering or charging a device, comprising:
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means for driving a first coil by a first signal having a first current value; and means for driving a second coil by a second signal having a second current value, the first and second currents being substantially equal in magnitude, the first coil and the second coil having a spiral configuration within a common plane that provides for co-location of substantially equal and opposite voltages within the first and second coils, respectively, at substantially any location on the common plane, the first coil and the second coil configured to wirelessly output power at a level sufficient to power or charge a receiver device. - View Dependent Claims (45)
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Specification