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Phase Shifted Transmitter (PST) operates without mixers and allows the direct generation and transmission of any envelope and phase-modulated signals. Besides of maintaining all the benefits of the standard PST architecture, the solution here proposed allows the integration of an energy recovery circuit capable to boost the efficiency of the overall transmitter up to 50%. The theoretical analysis...
Phase Shifted Transmitter (PST) operates without mixers and allows the direct generation and transmission of any envelope and phase-modulated signals. Besides of maintaining all the benefits of the standard PST architecture, the solution here proposed allows the integration of an energy recovery circuit capable to boost the efficiency of the overall transmitter up to 50%. The theoretical analysis...
This paper investigates and presents comparative performance of three different digital predistortion techniques for GaN-HEMT based Doherty power amplifier (DPA). Look-Up-Table (LUT), Memory polynomial (MP) and Volterra series based (VB) digital predistortion techniques are examined for the linearization of the DPA in LTE uplink applications. Experimental results demonstrate that for the same level...
In this paper, the features of GaN HEMT technology and Doherty Power Amplifier architecture will be investigated, as a possible answer for the stringent requirements of the next generation of wireless systems. In particular, the attention will be focused on the capabilities and the relevant drawbacks of a GaN HEMT technology when designing DPAs. The discussion of the most important DPA's design aspects...
An experimental test bed of a novel full analog microwave LINC SCS scheme is presented. The proposed implementation is suited for the RF section of typical microwave transmitter and could be useful when there is no access to the baseband circuitry. It's main characteristic is based on the predistortion of the gain law of a typical variable gain amplifier. The proposed experiment has been performed...
In this paper the closed-form synthesis issue for distributed matching networks operating at fundamental, second and third order harmonic frequencies is considered and solved. All the possible circuital solutions are examined and for the best circuit solution, the synthesis formulae are defined. Moreover, using the introduced formulae, a computer-aided design tool is presented to explore the potentialities...
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