In this article, the complete theoretical analysis of a Doherty amplifier employing a Class AB bias condition for the Main and a Class C one for the Auxiliary devices, respectively, is presented. Starting from the simplified model of an active device, the analysis of the AB-C Doherty behavior is carried out as a function of the input signal. In particular, the proposed approach is based on the analysis of the output drain current waveforms generated by the two active devices, while assuming a Tuned Load configuration (i.e., short circuit condition) for higher harmonic terminations. A closed form formulation is derived in order to directly design an AB-C Doherty amplifier, while fully understanding the basis of its physical behavior. Finally, which Doherty parameters can be chosen by the designer or have to be implicitly fixed are discussed and clarified

Colantonio, P., Giannini, F., Giofre', R., Piazzon, L. (2009). The AB-C Doherty power amplifier. part I: theory. INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, 19(3), 293-306 [10.1002/mmce.20350].

The AB-C Doherty power amplifier. part I: theory

COLANTONIO, PAOLO;GIANNINI, FRANCO;GIOFRE', ROCCO;PIAZZON, LUCA
2009-05-01

Abstract

In this article, the complete theoretical analysis of a Doherty amplifier employing a Class AB bias condition for the Main and a Class C one for the Auxiliary devices, respectively, is presented. Starting from the simplified model of an active device, the analysis of the AB-C Doherty behavior is carried out as a function of the input signal. In particular, the proposed approach is based on the analysis of the output drain current waveforms generated by the two active devices, while assuming a Tuned Load configuration (i.e., short circuit condition) for higher harmonic terminations. A closed form formulation is derived in order to directly design an AB-C Doherty amplifier, while fully understanding the basis of its physical behavior. Finally, which Doherty parameters can be chosen by the designer or have to be implicitly fixed are discussed and clarified
mag-2009
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore ING-INF/01 - ELETTRONICA
English
Con Impact Factor ISI
active load modulation; auxiliary; Doherty amplifier; high efficiency; main; power amplifier
Colantonio, P., Giannini, F., Giofre', R., Piazzon, L. (2009). The AB-C Doherty power amplifier. part I: theory. INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, 19(3), 293-306 [10.1002/mmce.20350].
Colantonio, P; Giannini, F; Giofre', R; Piazzon, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/27848
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