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US 10,826,440 B2Granted
Extended operational bandwidth amplifiers with fractional instantaneous bandwidth feed forward correction
AssigneeMotorola Solutions, Inc.
InventorRodney W. Hagen
Life of this patent
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Abstract
Apparatus and method for extended operational bandwidth amplifiers with fractional instantaneous bandwidth feed forward correction. In one embodiment, the method includes amplifying a radio frequency (RF) input signal to provide an amplified RF signal and introducing a first delay in the amplified RF signal. The method also includes receiving an error signal of the amplified RF signal and centering a correction bandwidth with respect to the amplified RF signal. The method also includes amplifying the error signal and combining the amplified RF signal and the amplified error signal to reduce an error in the amplified RF signal. The first delay is smaller than a second delay caused by the error path.
Claims14
A power amplifier comprising:
- a main amplifier amplifying a radio frequency (RF) input signal to provide an amplified radio frequency (RF) signal;
- a feed forward correction loop coupled to the main amplifier for cancelling intermodulation distortion in the amplified RF signal, the feed forward correction loop including
- a delay element in a main path of the feed forward correction loop,
- an error amplifier in an error path, and
- a composite phase shifter in the error path coupled to the error amplifier that centers a correction bandwidth with respect to the amplified RF signal,
- wherein the delay element introduces a first delay in the amplified RF signal that is smaller than a second delay caused by the error path,
- wherein the composite phase shifter includes:
- a phase shifter in the error path of the feed forward correction loop;
- and
- a phase extender in the error path coupled to the phase shifter that centers the phase shifter with respect to the amplified RF signal to center the correction bandwidth with respect to the amplified RF signal;
- a memory storing a mapping between a plurality of frequency sub-bands and a plurality of phase settings;
- and
- an electronic processor coupled to the memory and the feed forward correction loop and configured to
- determine an operating frequency sub-band of the power amplifier;
- determine a phase setting of the plurality of phase settings corresponding to the operating frequency sub-band;
- and
- control the phase extender to apply the phase setting.
14 more elements
A method for extending operation bandwidth of a power amplifier with fractional instantaneous bandwidth feed forward correction, the method comprising:
- amplifying, using a main amplifier, a radio frequency (RF) input signal to provide an amplified RF signal;
- introducing, using a delay element in a main path of a feed forward correction loop coupled to the main amplifier, a first delay in the amplified RF signal;
- receiving, in an error path of the feed forward correction loop, an error signal of the amplified RF signal;
- centering, using a composite phase shifter, a correction bandwidth with respect to the amplified RF signal, wherein the composite phase shifter includes a phase shifter and a phase extender;
- phase shifting, using the phase shifter, a phase of the error signal, wherein centering the correction bandwidth includes centering, using the phase extender, the phase shifter with respect to the amplified RF signal;
- amplifying, using an error amplifier, the error signal;
- combining, using a coupler, the amplified RF signal and the amplified error signal to reduce an error in the amplified RF signal,
- wherein the first delay is smaller than a second delay caused by the error path;
- storing, using a memory, a mapping between a plurality of frequency sub-bands and a plurality of phase settings;
- and
- determining, using an electronic processor coupled to the memory and the feed forward correction loop, an operating frequency sub-band of the power amplifier;
- determining, using the electronic processor, a phase setting of the plurality of phase settings corresponding to the operating frequency sub-band in the mapping;
- and
- controlling, using the electronic processor, the phase extender to apply the phase setting.
11 more elements
A power amplifier comprising:
- a main amplifier amplifying a radio frequency (RF) input signal to provide an amplified radio frequency (RF) signal;
- a feed forward correction loop coupled to the main amplifier for cancelling intermodulation distortion in the amplified RF signal, the feed forward correction loop including
- a delay element in a main path of the feed forward correction loop,
- an error amplifier in an error path, and
- a composite phase shifter in the error path coupled to the error amplifier that centers a correction bandwidth with respect to the amplified RF signal,
- wherein the delay element introduces a first delay in the amplified RF signal that is smaller than a second delay caused by the error path,
- wherein the composite phase shifter includes:
- a phase shifter in the error path of the feed forward correction loop;
- and
- a phase extender in the error path coupled to the phase shifter that centers the phase shifter with respect to the amplified RF signal to center the correction bandwidth with respect to the amplified RF signal, wherein the phase shifter includes quadrature reflection phase shifters and the phase extender includes delay line segments.
7 more elements
A method for extending operation bandwidth of a power amplifier with fractional instantaneous bandwidth feed forward correction, the method comprising:
- amplifying, using a main amplifier, a radio frequency (RF) input signal to provide an amplified RF signal;
- introducing, using a delay element in a main path of a feed forward correction loop coupled to the main amplifier, a first delay in the amplified RF signal;
- receiving, in an error path of the feed forward correction loop, an error signal of the amplified RF signal;
- centering, using a composite phase shifter, a correction bandwidth with respect to the amplified RF signal, wherein the composite phase shifter includes a phase shifter and a phase extender;
- phase shifting, using the phase shifter, a phase of the error signal, wherein centering the correction bandwidth includes centering, using the phase extender, the phase shifter with respect to the amplified RF signal, wherein the phase shifter includes quadrature reflection phase shifters and the phase extender includes delay line segments;
- amplifying, using an error amplifier, the error signal;
- and
- combining, using a coupler, the amplified RF signal and the amplified error signal to reduce an error in the amplified RF signal,
- wherein the first delay is smaller than a second delay caused by the error path.
6 more elements
Dependencies are inferred from the claim text.