Method and system for linearizing an amplifier using transistor-level dynamic feedback
OwnerAli Mohamed Darwishinventor
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Abstract
The present disclosure describes a method and system for linearizing an amplifier using transistor-level dynamic feedback. The method and system enables nonlinear amplifiers to exhibit linear performance using one or more of gain control elements and phase shifters in the feedback path. The disclosed method and system may also allow an amplifier to act as a pre-distorter or a frequency/gain programmable amplifier.
Claims20
A device for performing amplification of an input signal using dynamic feedback comprising:
- an amplifier adapted to amplify the input signal by a gain factor;
- one or more feedback paths coupled to an output and an input of the amplifier for conveying a feedback signal from an output signal of the amplifier to the input of the amplifier, wherein the one or more feedback paths includes one or more gain control elements for adjusting the magnitude of the feedback signal and wherein the one or more feedback paths are no longer than a wavelength of a highest operating frequency of the one or more feedback paths;
- and
- a controller coupled to the input of the amplifier prior to the one or more feedback paths and further coupled to the one or more gain control elements in the one or more feedback paths, wherein the controller is adapted to apply control voltages to the one or more gain control elements.
A system for performing amplification of an input signal using dynamic feedback comprising:
- an amplifier component adapted to amplify the input signal by a gain factor;
- one or more feedback components coupled to an output and an input of the amplifier component for conveying a feedback signal from an output signal of the amplifier component to the input of the amplifier component, wherein the one or more feedback components includes one or more gain control element components for adjusting the magnitude of the feedback signal and wherein the one or more feedback paths are no longer than a wavelength of a highest operating frequency of the one or more feedback paths;
- and
- a controller component coupled to the input of the amplifier component prior to the one or more feedback components and further coupled to the one or more gain control element components in the feedback path, wherein the controller component is adapted to apply control voltages to the one or more gain control element components.
A method for performing amplification of an input signal using dynamic feedback comprising:
- receiving an input signal, wherein the input signal is applied to an input of an amplifier;
- receiving an output signal, wherein the output signal is obtained from an output of an amplifier;
- applying one or more control voltages to one or more gain control elements for adjusting the magnitude of a feedback signal, wherein the one or more gain control elements are contained in one or more feedback paths coupled to an output and an input of the amplifier for conveying the feedback signal from an output signal of the amplifier to the input of the amplifier;
- and
- limiting the feedback signal to have a maximum operating frequency whose wavelength is equal to or less than the one or more feedback paths' physical length.
Dependencies are inferred from the claim text.