Power amplifiers, systems, and methods

摘要

An apparatus includes a cascode amplifier. The cascode amplifier includes a first transistor and a second transistor. The cascode amplifier is configured to receive a first bias voltage, a second bias voltage, and a signal. The cascode amplifier is also configured to amplify the signal based at least on the first bias voltage and the second bias voltage. The apparatus also includes a first feedback module and a second feedback module. The first feedback module is configured to adjust the first bias voltage based at least on the amplified signal. The second feedback module is configured to adjust the second bias voltage based at least on a voltage distribution across the first transistor and the second transistor. A system and method for maintaining cascode amplifier performance are also provided.

主权项

1. A system for maintaining cascode amplifier performance, the system comprising:
a cascode amplifier comprising:
a first primary transistor comprising a first terminal, a second terminal, and a third terminal, the first terminal of the first primary transistor being configured to receive a first bias voltage and a primary radio frequency (RF) input;a second primary transistor comprising 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; anda first capacitor coupled to the first terminal of the second primary transistor and one of ground or the second terminal of the second 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 circuit configured to determine a change in a first output voltage associated with the amplified primary RF input, the first feedback circuit being configured to adjust the first bias voltage based on the change in the first output voltage; anda second feedback circuit configured to determine a change in voltage distribution across the first primary transistor and the second primary transistor, the second feedback circuit being configured to adjust the second bias voltage based on the change in the voltage distribution.