Envelope-shaped bias for power amplifier
AssigneeQUALCOMM Incorporated
InventorChenliang Du
Life of this patent
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Abstract
This disclosure provides systems, methods and apparatuses for characterizing and operating a power amplifier. Before being placed into operation, output phase and output gain characteristics of the power amplifier may be determined over various operating conditions including varying two independent control signals and a supply voltage. The output phase and output gain characteristics may be stored for later retrieval. The power amplifier may be operated by determining a control signal profile for the two independent control signals based on operating conditions and radio-frequency (RF) envelope information associated with an input signal received by the power amplifier. The independent control signals may be generated in accordance with the control signal profile.
Claims30
An amplifier comprising:
- a first amplifying stage configured to receive a radio-frequency (RF) input signal;
- a second amplifying stage comprising an input coupled to an output of the first amplifying stage;
- and
- an amplifier controller configured to:
- provide a first bias signal for the first amplifying stage based on an RF envelope associated with the RF input signal;
- and
- provide a second bias signal for the second amplifying stage based on the RF envelope, wherein the first bias signal is independent of the second bias signal.
A method to operate a power amplifier comprising:
- amplifying, by a first stage, a radio-frequency (RF) input signal;
- amplifying, by a second stage, an intermediate signal provided by the first stage;
- providing a first bias signal to the first stage based on an RF envelope associated with the RF input signal;
- and
- providing a second bias signal to the second stage based on the RF envelope, wherein the first bias signal is independent of the second bias signal.
A power amplifier comprising:
- means for amplifying a radio-frequency (RF) input signal based on a first bias signal;
- means for amplifying an intermediate signal provided by the means for amplifying the RF input signal based on a second bias signal;
- and
- means for generating the first bias signal and the second bias signal based on an RF envelope associated with the RF input signal, wherein the first bias signal is independent of the second bias signal.
Dependencies are inferred from the claim text.