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Power amplifier (PA) behaviour modelling is a crucial technique for the improvement of telecommunication systems because it constitutes the core of a linearisation circuit that allows for the amplifier to develop high efficiencies at the same time that it delivers a linear output signal to the load. Polynomial filters can be used in order to represent both the non-linearities of the PA and the memory...
This paper proposes a new coefficient identification procedure to stabilize rational function predistorters. Rational functions are inherently capable of superior nonlinear modelling and extrapolative prediction, which make them ideal candidates for power amplifier (PA) predistortion. However their susceptibility to model divergence can lead to instability and linearization failure. In this paper,...
With upcoming trends of multiband, broadband and ultrawideband transmitters, there is a need for understanding and representing nonlinear transmitter behavior at system level at frequencies other than transmitter frequency, which might fall within the working range of ultra wideband power amplifier (PA) or other PAs. This paper presents characterization setup, data time-alignment technique and modeling...
This paper proposes a 2-D rational function based behavioral modeling approach for concurrent dual-band trans-mitters. It has been shown with measurement data that the recursive property of rational function model, being closer to the physical analogy of PA as feedback system, allows for more accurate modeling. Based on good performance of 2-D rational function, a novel two-step model has been proposed...
The use of active load-pull techniques in the design of high efficiency microwave amplifiers has been well documented. This paper describes how it has been applied to the design of a wideband RFIC gain stage. The technique is particularly relevant in new and developing processes where accurate device models are not available and designers otherwise are often forced to use multiple iterations of a...
In this paper, we present a real-time linearizing technique based on Real Valued Tapped Delay Neural Network (RVTDNN) for base band signal predistortion of Power Amplifier (PA). The proposed architecture is suitable for adaptive linearizing of PAs with memory effects. Instead of using indirect learning architecture, we propose a data on-line adaptive predistortion to ensure a continuous adaptation...
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