SYSTEMS AND METHODS FOR BIASING AMPLIFIERS USING ADAPTIVE CLOSED-LOOP CONTROL AND ADAPTIVE PREDISTORTION

摘要

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.

主权项

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.