Polar Modulation-Based RF Power Amplifiers with Enhanced Envelope Processing Technique

摘要

This research aims to develop high-efficiency linear RF power amplifier using polar modulation technique. In our proposed architecture, the in-phase and quadrature-phase components of baseband signal are transformed into the envelope and phase components in the digital domain. The envelope component is then delta-sigma modulated to drive a DC-to-DC converter. After filtering, the analog envelope signal has been amplified to modulate the phase-modulated carrier using a saturated power amplifier. The experimental results show that such a polar modulation-based RF power amplifier with proposed envelope processing technique has great potential to deal with high-power amplification of digital modulation carriers with time-varying envelope highly efficiently.