Power Amplifier Linearization

In high-efficiency power amplification, linearization is critical to maintaining signal fidelity. Distortion—especially in RF and audio systems—can severely degrade performance and lead to compliance issues in communication systems.

This research area investigates techniques to linearize power amplifiers, such as predistortion, negative feedback, and adaptive biasing. These methods are applicable in both analog and hybrid analog-digital designs.

Research objectives:

• Implement digital predistortion (DPD) for RF amplifiers.

• Develop temperature-aware bias control systems.

• Analyze intermodulation distortion (IMD) and total harmonic distortion (THD) under varying load conditions.

Key technologies:

• Class AB and Class D amplifier topologies.

• Embedded control systems (STM32, FPGA, DSP).

• Signal analysis tools including spectrum analyzers and FFT-based processing.

Application example:
Design of a 2.4 GHz power amplifier with >65% efficiency and IMD performance better than –45 dBc, intended for IoT transmitters and telemetry systems.