Method of power amplifier calibration for an envelope tracking system
First Claim
1. A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device comprising:
- measuring an output power of a PA that is a part under test (PUT) at a predetermined input power;
calculating a gain equal to the output power of the PA divided by the predetermined input power;
calculating a gain correction by subtracting the calculated gain from a desired gain;
determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage;
determining a first difference between a measured PA supply voltage and a nominal PA supply voltage value for a first input power;
determining a second difference between a measured PA supply voltage and a nominal PA supply voltage value for a second input power;
calculating a slope and an intercept for a line that that yields calibration values as a function of PA supply voltage using the first difference, the second difference, the first input power, and the second input power; and
storing the calibration values for PA supply voltage versus input power in a look up table memory that is accessible by the wireless device.
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Accused Products
Abstract
A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device is disclosed. The method involves measuring an output power of a PA that is a part under test (PUT) at a predetermined input power. Another step includes calculating a gain equal to the output power of the PA divided by the predetermined input power. A next step involves calculating a gain correction by subtracting the calculated gain from a desired gain. Other steps include determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage, and then storing the expected supply voltage for the PA versus input power in memory.
297 Citations
17 Claims
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1. A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device comprising:
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measuring an output power of a PA that is a part under test (PUT) at a predetermined input power; calculating a gain equal to the output power of the PA divided by the predetermined input power; calculating a gain correction by subtracting the calculated gain from a desired gain; determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage; determining a first difference between a measured PA supply voltage and a nominal PA supply voltage value for a first input power; determining a second difference between a measured PA supply voltage and a nominal PA supply voltage value for a second input power; calculating a slope and an intercept for a line that that yields calibration values as a function of PA supply voltage using the first difference, the second difference, the first input power, and the second input power; and storing the calibration values for PA supply voltage versus input power in a look up table memory that is accessible by the wireless device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A calibration system for calibrating a PA for an envelope tracking system of a wireless device comprising:
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a memory to store an expected supply voltage of the PA; a processor programmed to; measure an output power of a PA that is a part under test (PUT) at a predetermined input power; calculate a gain equal to the output power of the PA divided by the predetermined input power; calculate a gain correction by subtracting the calculated gain from a desired gain; and determine an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage; determine a first difference between a measured PA supply voltage and a nominal PA supply voltage value for a first input power; determine a second difference between a measured PA supply voltage and a nominal PA supply voltage value for a second input power; calculate a slope and an intercept for a line that that yields calibration values as a function of PA supply voltage using the first difference, the second difference, the first input power, and the second input power; and store the calibration values for PA supply voltage versus input power in a look up table memory that is accessible by the wireless device. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device comprising:
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measuring an output power of a PA that is a part under test (PUT) at a predetermined input power; calculating a gain equal to the output power of the PA divided by the predetermined input power; calculating a gain correction by subtracting the calculated gain from a desired gain; determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage; storing the expected supply voltage for the PA versus input power in memory; repeating the method steps until N expected supply voltages for the PA are stored; determining an N difference between an expected PA supply voltage and a nominal PA supply voltage value for an N input power; determining an N+1 difference between a measured PA supply voltage and a nominal PA supply voltage value for an N+1 input power; calculating a slope and an intercept for a line that that yields calibration values as a function of PA supply voltage using the N difference, the N+1 difference, the N input power, the N+1 input power, and a nominal PA supply voltage for the N input power; and storing the calibration values for PA supply voltage versus input power in a look up table memory that is accessible by the wireless device. - View Dependent Claims (14, 15, 16, 17)
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Specification