Method and apparatus for power amplifier linearization
AssigneeNewlans, Inc.
InventorDev V. Gupta
Life of this patent
Estimating the term…
Abstract
In an embodiment, a circuit includes a variable group delay configured to delay a wideband input signal to obtain a delayed input signal; a wideband operational amplifier configured to determine an error signal based on a difference between the delayed input signal and a linearized power amplifier output; a feedback amplifier configured to amplify the error signal to obtain an amplified error signal; and a directional combiner configured to combine the amplified error signal with the power amplifier output to obtain the linearized power amplifier output.
Claims20
A circuit comprising:
- a variable group delay configured to delay a wideband input signal to obtain a delayed input signal;
- a wideband operational amplifier configured to determine an error signal based on a difference between the delayed input signal and a linearized power amplifier output;
- a feedback amplifier configured to amplify the error signal to obtain an amplified error signal;
- and
- a directional combiner configured to combine the amplified error signal with a power amplifier output to obtain the linearized power amplifier output,
- wherein the feedback amplifier comprises:
- another variable group delay configured to delay the error signal to obtain a delayed error signal;
- another wideband operational amplifier configured to determine another error signal based on a difference between the delayed error signal and the amplified error signal;
- another feedback amplifier configured to amplify the another error signal to obtain another amplified error signal;
- and
- another directional combiner configured to combine the another amplified error signal with an output of the feedback amplifier to obtain the amplified error signal.
A method of linearizing the output of a power amplifier, the method comprising:
- delaying a wideband input signal to obtain a delayed input signal;
- determining an error signal based on a difference between the delayed input signal and a linearized power amplifier output;
- amplifying the error signal to obtain an amplified error signal;
- and
- combining the amplified error signal with the power amplifier output to obtain the linearized power amplifier output, wherein amplifying the error signal comprises:
- delaying the error signal to obtain a delayed error signal;
- determining another error signal based on a difference between the delayed error signal and the amplified error signal;
- amplifying the another error signal to obtain another amplified error signal;
- and
- combining the another amplified error signal with an output of the feedback amplifier to obtain the amplified error signal.
Dependencies are inferred from the claim text.