SYSTEMS AND METHODS FOR BIASING AMPLIFIERS USING ADAPTIVE CLOSED-LOOP CONTROL AND ADAPTIVE PREDISTORTION
First Claim
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1. A method comprising:
- determining an optimized quiescent drain current value for a drain current of a power amplifier while the power amplifier is operating under an operational parameter and while a power amplifier input signal received by the power amplifier is based on a first non-predistorted signal;
storing the optimized quiescent drain current value as saved drain current data;
determining a set of calibrated drain current values for the drain current, the set of calibrated drain current values being calibrated for a set of power levels for a power amplifier output signal while the power amplifier is operating under the operational parameter and while the power amplifier input signal received by the power amplifier is based on a second non-predistorted signal;
storing the set of calibrated drain current values in the saved drain current data;
comparing a present drain current value of the drain current to a particular drain current value in the saved drain current data while the power amplifier input signal received by the power amplifier is based on a predistorted signal;
determining whether the comparing the present current value to the particular current value satisfies a condition; and
adjusting the drain current based on the particular drain current value if the condition is determined to be satisfied.
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Abstract
Various embodiments described herein provide systems and methods for improved performance for power amplifiers, particularly GaN power amplifiers. According to some embodiments, a power amplifier (e.g., GaN power amplifier) utilizes adaptive predistortion and adaptive closed-loop control of the drain current of the power amplifier to achieve improved power amplifier performance.
25 Citations
27 Claims
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1. A method comprising:
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determining an optimized quiescent drain current value for a drain current of a power amplifier while the power amplifier is operating under an operational parameter and while a power amplifier input signal received by the power amplifier is based on a first non-predistorted signal; storing the optimized quiescent drain current value as saved drain current data; determining a set of calibrated drain current values for the drain current, the set of calibrated drain current values being calibrated for a set of power levels for a power amplifier output signal while the power amplifier is operating under the operational parameter and while the power amplifier input signal received by the power amplifier is based on a second non-predistorted signal; storing the set of calibrated drain current values in the saved drain current data; comparing a present drain current value of the drain current to a particular drain current value in the saved drain current data while the power amplifier input signal received by the power amplifier is based on a predistorted signal; determining whether the comparing the present current value to the particular current value satisfies a condition; and adjusting the drain current based on the particular drain current value if the condition is determined to be satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system comprising:
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means for determining an optimized quiescent drain current value for a drain current of a power amplifier while the power amplifier is operating under an operational parameter and while a power amplifier input signal received by the power amplifier is based on a first non-predistorted signal; means for storing the optimized quiescent drain current value as saved drain current data; means for determining a set of calibrated drain current values for the drain current, the set of calibrated drain current values being calibrated for a set of power levels for a power amplifier output signal while the power amplifier is operating under the operational parameter and while the power amplifier input signal received by the power amplifier is based on a second non-predistorted signal; means for storing the set of calibrated drain current values in the saved drain current data; means for comparing a present drain current value of the drain current to a particular drain current value in the saved drain current data while the power amplifier input signal received by the power amplifier is based on a predistorted signal; means for determining whether the comparing the present current value to the particular current value satisfies a condition; and means for adjusting the drain current based on the particular drain current value if the condition is determined to be satisfied.
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15. A system comprising:
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a power amplifier having a power amplifier input signal, a power amplifier output signal and a drain current; a power amplifier calibration module configured to determine an optimized quiescent drain current value for the drain current while the power amplifier is operating under an operational parameter and while the power amplifier input signal received by the power amplifier is based on a first non-predistorted signal, and to determine a set of calibrated drain current values for the drain current, the set of calibrated drain current values being calibrated for a set of power levels for the output signal while the power amplifier is operating under the operational parameter and while the power amplifier input signal received by the power amplifier is based on a second non-predistorted signal; a storage module configured to store the optimized quiescent drain current value and the set of calibrated drain current values as saved drain current data; and a power amplifier operation module configured to compare a present drain current value of the drain current to a particular drain current value in the saved drain current data while the power amplifier input signal received by the power amplifier is based on a predistorted signal, determine whether the comparing the present current value to the particular current value satisfies a condition, and adjust the drain current based on the particular drain current value if the condition is determined to be satisfied. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification