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US 8,477,832 B2Granted
Load insensitive quadrature power amplifier power detector
AssigneeSkyworks Solutions, Inc.
InventorDavid Sawatzky
Life of this patent
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Abstract
A power detector includes a first phase shift element implemented to shift a phase of a first input signal to generate a first phase-shifted signal, a second phase shift element implemented to alter a phase of a second input signal to generate a second phase-shifted signal, a combiner for combining the first phase-shifted signal and the second phase-shifted signal to generate a combined single-phase signal, and a single element power detector for determining a power of the combined single-phase signal.
Claims18
A power detector comprising:
- a first phase shift element implemented to shift a phase of a first radio frequency (RF) input signal to generate a first phase-shifted signal, the first RF input signal being an output of a final amplification stage of a first set of power amplifier stages including at least an initial amplification stage and the final amplification stage;
- a second phase shift element implemented to shift a phase of a second RF input signal to generate a second phase-shifted signal, the second RF input signal being an output of a final amplification stage of a second set of power amplifier stages including at least an initial amplification stage and the final amplification stage;
- a resistive combiner for combining the first phase-shifted signal and the second phase-shifted signal to generate a combined single-phase signal;
- and
- a single element power detector for determining a power of the combined single-phase signal.
2 more elements
A power amplifier comprising:
- a first amplification path including an initial amplification stage and a final amplification stage of a first set of power amplifier stages configured to provide a first amplified radio frequency (RF) signal at an output of the final amplification stage of the first set of power amplifier stages;
- a second amplification path including an initial amplification stage and a final amplification stage of a second set of power amplifier stages configured to provide a second amplified RF signal at an output of the final amplification stage of the second set of power amplifier stages;
- and
- a power detector including a first phase shift element implemented to shift a phase of the first amplified RF signal resulting in a first phase-shifted signal, a second phase shift element implemented to shift a phase of the second amplified RF signal resulting in a second phase-shifted signal, a resistive combiner for combining the first phase-shifted signal and the second phase-shifted signal to generate a combined single-phase signal, and a single element power detector for determining a power of the combined single-phase signal.
1 more element
A method for power detection comprising:
- providing a radio frequency (RF) output signal of a final amplification stage of a first set of power amplifier stages to a first phase shift element implemented to shift a phase of the RF output signal of the final amplification stage of the first set of power amplifier stages to generate a first phase-shifted signal, the first set of power amplifier stages including at least an initial amplification stage and the final amplification stage;
- providing an RF output signal of a final amplification stage of a second set of power amplifier stages to a second phase shift element implemented to shift a phase of the RF output signal of the final amplification stage of the second set of power amplifier stages to generate a second phase-shifted signal, the second set of power amplifier stages including at least an initial amplification stage and the final amplification stage;
- resistively combining the first phase-shifted signal and the second phase-shifted signal to generate a combined single-phase signal;
- and
- determining a power of the combined single-phase signal using a single element power detector.
2 more elements
Dependencies are inferred from the claim text.