Systems and methods for maintaining power amplifier performance

A method for maintaining power amplifier performance, the method comprising:

• generating a bias voltage;
• receiving, by at least one primary power amplifier (PA), the bias voltage and a primary radio frequency (RF) input;
• amplifying, by the at least one primary PA, the primary RF input based on the bias voltage;
• receiving, by an auxiliary PA connected in parallel with the at least one primary PA, the bias voltage and an auxiliary RF input, the auxiliary RF input being a scaled version of the primary RF input by a scale factor;
• amplifying, by the auxiliary PA, the auxiliary RF input based on the bias voltage;
• measuring an output voltage associated with the amplified auxiliary RF input;
• comparing the measured output voltage to a reference voltage;
• and
• adjusting the bias voltage provided to the auxiliary PA and the at least one primary PA based on the comparison of the measured output voltage to the reference voltage.

A system for maintaining cascode amplifier performance, the system comprising:

• a cascode amplifier comprising:
• a first primary transistor having a first terminal, a second terminal, and a third terminal, the first terminal being configured to receive a first bias voltage and a primary radio frequency (RF) input;
• and
• a second primary transistor having a first terminal, a second terminal, and a third terminal, the first terminal of the second primary transistor being configured to receive a second bias voltage, the third terminal of the second primary transistor being coupled to the second terminal of the first primary transistor,
• wherein the cascode amplifier is configured to amplify the primary RF input based on the first bias voltage and the second bias voltage;
• a first feedback module configured to determine a change in a first output voltage of the amplified primary RF input, the first feedback module being configured to adjust the first bias voltage based on the change in the first output voltage;
• and
• a second feedback module configured to determine a change in voltage distribution across the first primary transistor and the secondary primary transistor, the second feedback module being configured to adjust the second bias voltage based on the change in the voltage distribution.