Adaptive Input-Power Distribution in Doherty Power Amplifiers for Linearity and Efficiency Enhancement

Autor:	Morteza Nick, Amir Mortazawi
Rok vydání:	2010
Předmět:	Engineering Power-added efficiency Radiation business.industry Amplifier Electrical engineering Linearity Input impedance Condensed Matter Physics Power electronics Electronic engineering Linear amplifier Electrical and Electronic Engineering Direct-coupled amplifier business Doherty amplifier
Zdroj:	IEEE Transactions on Microwave Theory and Techniques. 58:2764-2771
ISSN:	1557-9670 0018-9480
DOI:	10.1109/tmtt.2010.2077930
Popis:	A new technique based on an adaptive input-power distribution is introduced to overcome the limitations of practical Doherty power amplifiers. The proposed Doherty amplifier employs an extended-resonance power-divider at its input. By taking advantage of the auxiliary cell's nonlinear input impedance, the extended-resonance divider is designed such that it provides a proper power-dependent power-division between the main and auxiliary cells. Therefore, the two cells are efficiently driven and can generate output current and voltage characteristics similar to the ideal Doherty amplifier, resulting in both linearity and efficiency improvements. The performance of the new Doherty amplifier is compared with a conventional design through simulations and measurements. The proposed Doherty amplifier achieves a measured ACLR improvement of 5-7 dB over a wide range of output power levels, as well as an increased power-added-efficiency of up to 5% for WCDMA signals. The proposed Doherty design does not require complex circuitry and yields a compact circuit.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7c41e042bcdcea1b0adc042173d507e3 https://doi.org/10.1109/tmtt.2010.2077930 Zobrazit plný text záznamu