Independence between paths that predistort for memory and memory-less distortion in power amplifiers
First Claim
Patent Images
1. A predistorter for reducing spurious emissions in an amplified signal comprising:
- a first path configured to generate memory-less distortion correction;
a second path configured to generate memory distortion correction; and
at least one dynamically controllable delay circuit located in at least one of the first and second paths and configured to render the memory-less and memory distortion corrections independent from one another over a plurality of operating frequencies for the predistorter, wherein the first path is disposed in a first layer, and the second path is disposed in a second layer, wherein the second layer further comprises a third path, wherein the second path is a second layer long path and the third path is a second layer short path, and wherein the dynamically controllable delay circuit is configured to add a delay to the second layer long path that is an integer number of wavelengths long relative to a delay added to the second layer short path at the frequency of use of the predistorter.
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Abstract
A predistorter for reducing spurious emissions in an amplified signal including a first path configured to generated memory-less distortion correction and one or more second paths configured to generate memory distortion correction. The paths contain one or more dynamically controllable delay circuits that are configured such that the memory-less and memory distortion correction remains independent irrespective of frequency of use of the predistorter.
78 Citations
23 Claims
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1. A predistorter for reducing spurious emissions in an amplified signal comprising:
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a first path configured to generate memory-less distortion correction; a second path configured to generate memory distortion correction; and at least one dynamically controllable delay circuit located in at least one of the first and second paths and configured to render the memory-less and memory distortion corrections independent from one another over a plurality of operating frequencies for the predistorter, wherein the first path is disposed in a first layer, and the second path is disposed in a second layer, wherein the second layer further comprises a third path, wherein the second path is a second layer long path and the third path is a second layer short path, and wherein the dynamically controllable delay circuit is configured to add a delay to the second layer long path that is an integer number of wavelengths long relative to a delay added to the second layer short path at the frequency of use of the predistorter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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an RF amplifier configured to amplify a signal; and
,a predistorter coupled to the RF amplifier and configured to reduce spurious emissions in an amplified signal, the predistorter comprising; a first path configured to generate memory-less distortion correction; a second path configured to generate memory distortion correction; at least one dynamically controllable delay circuit located in at least one of the first and second paths and configured to render the memory-less and memory distortion corrections independent from one another over a plurality of frequencies for the predistorter; wherein the first path is disposed in a first layer, and the second path is disposed in a second layer, wherein the second layer further comprises a third path, wherein the second path is a second layer long the third path is a second layer short path, and wherein the dynamically controllable delay circuit is configured to add a delay to the second layer long path that is an integer number of wavelengths long relative to a delay added to the second layer short path at the frequency of use of the predistorter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of reducing spurious emissions in an amplified signal using a predistorter wherein the predistorter includes first and second paths and at least one delay circuit located in at least one of the first and second paths, the method comprising:
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correcting for memory-less distortion using the first path; correcting for memory distortion using the second path; and
,dynamically controlling the delay circuit to render the memory-less and memory distortion corrections independent from one another over a plurality of operating frequencies for the predistorter; wherein the first path is disposed in a first layer, and the second path is disposed in a second layer, wherein the second layer further comprises a third path, wherein the second path is a second layer long path and the third path is a second layer short path, and wherein dynamically controlling the delay circuit comprises adding delay to the second layer long path that is an integer number wavelengths long relative to delay added to the second layer short path. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification