Citation
Tena Ramos, David and Ortega González, Francisco Javier and Patiño Gómez, Moises and Pardo Martín, José Manuel
(2015).
Nueva técnica de modulación de excitación para sistemas EER.
In: "XXX Simposium Nacional de la Unión Científica Internacional de Radio, URSI 2015", 02/09/2015 - 04/09/2015, Pamplona, España. pp. 1-4.
Abstract
This paper shows a novel drive modulation technique applied to a high power, high efficiency, linear Envelope Elimination and Restoration (EER) amplifier for L-Band. It comprises a mixed-mode suboptimum Class-E / Class-A wideband RF amplifier based on a dual GaN HEMT for RF carrier amplification and a high efficiency, high switching frequency, multi-phase, buck power converter based on Silicon LDMOS transistors to work as a modulator (or envelope amplifier). The linearity and power gain for this EER amplifier is improved by means of a new digital drive modulation technique and digital predistortion (DPD) to achieve linearity performances equivalent or better than Class-AB amplifiers of similar output power level and frequency band but exhibiting much higher efficiency. This EER amplifier provides 120W peak output power at the L-band without any adjustment. In a two tone test, measured third and fifth-order intermodulation products were -45 dBc and -49 dBc, respectively, reaching 67.5 % maximum PAE.
