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Since the complexity of a reconfigurable transmitter architecture increases with the number of variable parameters, a methodology to optimize architectures based on discrete reconfigurable matching networks (RMNs) is presented. A design with two RMNs and a stabilized power transistor is used to test the proposed algorithm. A band-reconfigurable efficiency-optimized power amplifier (PA) and a frequency-tunable...
This paper proposes the use of a transmitter based on a linear amplification with nonlinear components (LINC) architecture, in which the reconfigurable matching networks (RMNs) are included. By varying the RMN active cell number, it is possible to change the load impedance at the power amplifier (PA) output, improving the amplifier drain efficiency and therefore the efficiency of the whole system...
A novel modeling technique is proposed to improve the Radio over Fiber (RoF) modeling and the Predistorter identification. This method is based on an orthogonal basis composed by Zernike polynomials, whose features guarantee numerical stability, a problem present in the classical polynomial model based on Volterra series. The measurements have been carried out with a LTE downlink signal with a bandwith...
An efficiency-optimized transmitter architecture for multi-band and OFDM (Orthogonal Frequency Division Multiplexing)-based standards operation is proposed and evaluated. It utilizes a power amplifier (PA) stood on a VDMOS transistor and two reconfigurable matching networks (RMNs). By means of frequency-independent both source and load mismatch correction, the reconfigurability provided by the RMNs...
An optimized process for linearity and efficiency performance using a reconfigurable matching network (RMN) for power amplifiers (PAs) is presented. Long-term evolution (LTE) waveforms modeled as multisine excitations are used to simulate a general purpose PA, assuming that the antenna is perfectly matched. Selecting RMN state for linearity the adjacent channel power ratio (ACPR) is improved while...
The efficiency-linearity tradeoff is a very challenging aspect in the design of RF front-ends. An optimized process for both linearity and efficiency performance improvement using a reconfigurable matching network (RMN) for wideband power amplifiers (PAs) is presented. Long-term evolution (LTE) waveforms modeled as multisine excitations are used to simulate a general purpose PA, assuming that the...
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