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Continuous-time adaptive control applied to rf amplifier linearization
Bertran Albertí, Eduardo; Montoro López, Gabriel; Talavera Pedrol, Núria
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. Departament d'Organització d'Empreses; Universitat Politècnica de Catalunya. CSC - Components and Systems for Communications Research Group
A new approach to the RF power amplifier linearization problem is presented. The proposed solution applies non-linear theories (Lyapunov direct method) to adaptive filtering in order to improve the linearity of the RF amplifiers. The obtained design requires lower circuit complexity than the LINC amplifier, and is not based on iterative algorithms nor sub-system identification. Up to 100 MHz these functions could be implemented, at present, with operational amplifiers and integrated analog multipliers (four quadrants). The adjusting algorithm convergence or the interruption of the communication are not problems in the proposed adaptive solution. The canceller structure design is based on model reference adaptive systems (MRAS): to cancel the error between the plant output (distortion output of the RF amplifier) and reference model (the desired signal obtained from a linear and low-power amplifier) by using continuous-time techniques. The proposed structure is studied by computer simulation (SPICE program) in a class-A RF power amplifier, The behaviour of the adapted amplifier is studied when power transistors approach nonlinear operating zones (saturation state).
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació
Telecommunication
model reference adaptive control systems
Power amplifiers
Adaptive control
Continuous time systems
Linearisation techniques
Lyapunov methods
Adaptive filters
VHF amplifiers
Land mobile radio
Telecomunicació
info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
O.YUKSEL IEEE
         

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