Metodologia sistemàtica de disseny de filtres d'ona acústica integrats en multiplexors i mòduls codissenyats
- Autores: Patrícia Silveira
- Directores de la Tesis: Pedro Antonio de Paco Sánchez (dir. tes.)
- Lectura: En la Universitat Autònoma de Barcelona ( España ) en 2021
- Idioma: catalán
- Tribunal Calificador de la Tesis: Juan Carlos Collado Gómez (presid.), Albert Crespo Yepes (secret.), Jose Angel García Garcia (voc.)
- Programa de doctorado: Programa de Doctorado en Ingeniería Electrónica y de Telecomunicación por la Universidad Autónoma de Barcelona
- Materias:
- Enlaces
- Tesis en acceso abierto en: TDX
- Resumen
The worldwide implementation of 5G technology and the extended use of wireless networks have boosted the fast-paced increase in the radio frequency bands number supported by smartphones and other mobile devices. Simultaneously, to increment the connection speed, the modulation scheme complexity, antenna number, and carrier aggregated are increasing. These specifications require advances in the RF filter technology to ensure the proper selection of each carrier and the full information acquisition. Additionally, smaller devices are needed for a shrinking space and also be able to handle higher powers in a highly integrated scenario.
In this challenging environment, resonators based on acoustic wave (AW) technology have demonstrated to be the solution for the market requirements. The AW filter design has been driven by optimization techniques that require a time-consuming process and computational efforts, being inefficient from the industry point of view. Nevertheless, simulation tools based on advanced synthesis techniques considering the technological accommodation have been developed in our research group in the last years. These tools provide precise and fast solutions as the first tier for a later optimization procedure.
The principal purpose of this thesis is to meet the current demands of integration of multiple filters in one RF module, namely multiplexers, and also including power amplifiers (PA) to reduce the device size inside the smartphones. For the multiplexers design, the Minimum Susceptance Networks (MSN) concept has been exploited, introducing the reflection coefficient phase control as a key element for this kind of network classification. Two probable scenarios were analyzed regarding the frequency plan: fixed and flexible. The latter is a complex case boosted by the advent of the Carrier Aggregation technology and the market requirements. The proposed methodology guarantees technological feasibility and mask specifications fulfillment for each channel.
As part of the AW filters module integration, this thesis addresses the synthesis considering complex source/load impedances. The proposal allows the co-design of filters with active or passive networks removing the common inter-stage matching network. It is illustrated the co-design process for power amplifiers and filters analyzing each part's features to ensure high efficiency and output power in the passband. Simultaneously, a Chebyshev filter response is obtained in the resulting device.
Moreover, the phase control with different purposes is also discussed in this document. The theoretical analysis has been supported by simulated examples and manufacturing prototypes that show the approach's pertinence. The achieving results have been summarized at each chapter's end.
