Publicação
Design and characterization of power amplifiers for emerging technologies
| Resumo: | Advanced wireless communication systems require e cient communication links in terms of data rates and spectral e ciency. Such requirements are supported by advanced complex modulation schemes. With the increasing time domain statistical complexity of the modulation signals, linearity and power e ciency trade-o over the wide bandwidth imposes limitations on QoS o ered by the wireless transceivers. Power ampli er (PA) is one of the important components that su er majorly with this trade-o in wideband applications. PA design and characterization process using Continuous Wave (CW) excitation may lead to an inadequate performance for the modulation domain of applications. Moreover, PA design needs to be supported by advanced test models obtained from wideband linearity characterization, such as ACPR, EVM, or NPR to support complex time domain modulated signal statistics. Experimental characterization of Device Under Test (DUT) using load-pull setup virtually o ers a matching network that is implemented by the load tuners. This helps in performance prediction and optimization of the nal PA design. Thus, the work proposed in this thesis provides a reliable platform for the DUT characterization using a wideband modulated load-pull test bench. Using it, the impacts of time domain statistics, such as CCDF and PAPR of the modulated signal are investigated at the circuit level (at the intrinsic and extrinsic level). DUT characterization through the loadpull process is strongly dependent on the time domain statistics of the test signals. This creates multiple sub-optimal conditions in modulated loadpull analysis. In this case, the PA performance enhancement using strategy, such as frequency-dependent matched load will be discussed. Moreover, the multi-tone modulated load-pull process is a multi-dimensional problem and it has multiple optimum solutions. A lack of standard procedure for the modulated load-pull analysis leads to variation in the performance parameters extracted using di erent test benches or di erent excitation con gurations of the same test bench. To address this, a systematic approach to the nonlinear load-pull characterization process using multi-tone stimuli will be proposed in this thesis. It o ers the best Optimum Load Approximation (OLA) that can be more reliable and relatable to generalize the performance parameters for a specific class of signals. |
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| Autores principais: | Chaudhary, Sanket Virsangbhai |
| Assunto: | CCDF Load-pull analysis Modulated excitation Muti-tone stimuli PAPR Power amplifier characterization Statistical analysis Wideband nonlinear characterization |
| Ano: | 2023 |
| País: | Portugal |
| Tipo de documento: | tese de doutoramento |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Aveiro |
| Idioma: | inglês |
| Origem: | RIA - Repositório Institucional da Universidade de Aveiro |
| Resumo: | Advanced wireless communication systems require e cient communication links in terms of data rates and spectral e ciency. Such requirements are supported by advanced complex modulation schemes. With the increasing time domain statistical complexity of the modulation signals, linearity and power e ciency trade-o over the wide bandwidth imposes limitations on QoS o ered by the wireless transceivers. Power ampli er (PA) is one of the important components that su er majorly with this trade-o in wideband applications. PA design and characterization process using Continuous Wave (CW) excitation may lead to an inadequate performance for the modulation domain of applications. Moreover, PA design needs to be supported by advanced test models obtained from wideband linearity characterization, such as ACPR, EVM, or NPR to support complex time domain modulated signal statistics. Experimental characterization of Device Under Test (DUT) using load-pull setup virtually o ers a matching network that is implemented by the load tuners. This helps in performance prediction and optimization of the nal PA design. Thus, the work proposed in this thesis provides a reliable platform for the DUT characterization using a wideband modulated load-pull test bench. Using it, the impacts of time domain statistics, such as CCDF and PAPR of the modulated signal are investigated at the circuit level (at the intrinsic and extrinsic level). DUT characterization through the loadpull process is strongly dependent on the time domain statistics of the test signals. This creates multiple sub-optimal conditions in modulated loadpull analysis. In this case, the PA performance enhancement using strategy, such as frequency-dependent matched load will be discussed. Moreover, the multi-tone modulated load-pull process is a multi-dimensional problem and it has multiple optimum solutions. A lack of standard procedure for the modulated load-pull analysis leads to variation in the performance parameters extracted using di erent test benches or di erent excitation con gurations of the same test bench. To address this, a systematic approach to the nonlinear load-pull characterization process using multi-tone stimuli will be proposed in this thesis. It o ers the best Optimum Load Approximation (OLA) that can be more reliable and relatable to generalize the performance parameters for a specific class of signals. |
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