Method for tuning an envelope tracking amplification system
AssigneeMotorola, Inc.
InventorsDale Anderson, James E. Mitzlaff
Life of this patent
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Abstract
An optimal operating point of an envelope tracking amplification system that includes a radio frequency (RF) power amplifier having an RF amplifying element is determined based on an application to the RF power amplifier of a supply voltage that is less than the rated voltage of the RF amplifying element.
Claims19
A method for tuning an envelope tracking amplification system having a radio frequency (RF) power amplifier, the method comprising steps of:
- determining a preferred operating point for the RF power amplifier for each supply voltage of a first set of supply voltages to produce a plurality of preferred operating points;
- for each preferred operating point of the plurality of preferred operating points, determining, for each supply voltage of a second set of supply voltages, a relationship between an operating parameter of the RF power amplifier and a signal coupled to an input of the RF power amplifier to produce a plurality of relationships associated with the preferred operating point;
- for each preferred operating point of the plurality of preferred operating points, determining a range of acceptable operation of the RF power amplifier based on the plurality of relationships associated with the preferred operating point;
- and
- comparing the range of acceptable operation determined with respect to each preferred opting point of the plurality of preferred operating points to the ranges of acceptable operation determined with respect to the other preferred operating points of the plurality of preferred operating points to produce at least one comparison;
- and
- determinng an optimal operating point based on the at least one comparison.
The method of clam 6, wherein the at least one test signal comprises a plurality of test signals, wherein each test signal of the plurality of test signals is at a different frequency than the other test signals of the plurality of test signals, and wherein the step of adjusting the output matching circuit in order to optimize a designated operating parameter comprises a step of adjust the output matching circuit in order to optimize a designated operating parameter across each of the plurality of test signal frequencies.
A method for tuning an envelope tracking amplification system having a radio frequency (RF) power amplifier comprising steps of:
- determining an operating point for each supply voltage of a plurality of supply voltages to produce a plurality of operating points;
- setting a first operating point of the plurality of operating points and, in response to setting the first operating point:
- coupling a first supply voltage to the RF power amplifier;
- coupling a first input signal to an input of the RF power amplifier;
- amplifying the first input signal to produce a first amplified signal;
- measuring an operating parameter of the RF power amplifier based on the first amplified signal to produce a first operating parameter measurement;
- coupling a second supply voltage to the RF power amplifier;
- coupling a second input signal to the input of the RF power amplifier;
- amplifying the second input signal to produce a second amplified signal;
- measuring an operating parameter of the RF power amplifier based on the input signal and the second amplified signal to produce a second operating parameter measurement;
- setting a second operating point of the plurality of operating points and, in response to setting the second operating point:
- coupling the first supply voltage to the RF power amplifier;
- coupling a third input signal to the input of the RF power amplifier;
- amplifying the third input signal to produce a third amplified signal;
- measuring an operating parameter of the RF power amplifier based on the third amplified signal to produce a third operating parameter measurement;
- coupling the second supply voltage to the RF power amplifier;
- coupling a fourth input signal to an input of the RF power amplifier;
- amplifying the fourth input signal to produce a fourth amplified signal;
- measuring an operating parameter of the RF power amplifier based on the fourth amplified signal to produce a fourth operating parameter measurement;
- and
- determining an optimal operating point based on the first operating parameter measurement, the second operating parameter measurement, the third operating parameter measurement, and the fourth operating parameter measurement.
Dependencies are inferred from the claim text.