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Projecte llegit

Títol: Simulation of distributed nonlinearities of electroacoustic resonators using the Thevenin theorem

Estudiants que han llegit aquest projecte:

Director/a: COLLADO GÓMEZ, CARLOS

Departament: TSC

Títol: Simulation of distributed nonlinearities of electroacoustic resonators using the Thevenin theorem

Data inici oferta: 29-01-2025     Data finalització oferta: 31-01-2025


Estudis d'assignació del projecte:
    DG ENG AERO/SIS TEL
Tipus: Individual
 
Lloc de realització: EETAC
 
Segon director/a (UPC): MATEU MATEU, JORDI
 
Paraules clau:
No linealidades, electracústicos, BAW, SAW, resonadores
 
Descripció del contingut i pla d'activitats:
Es proposa aplicar el teorema de Thevenin per unificar les fonts no lineals obtingudes amb el mètode IOES (Input-Output Equivalent Sources) en una única font a l'entrada del ressonador.
Per assolir aquest objectiu, es seguiran els passos següents:
1. Analitzar i comprendre tant el mètode IOES com el teorema de Thevenin.
2. Desenvolupar l'expressió matemàtica de la font equivalent en ressonadors BAW i SAW.
3. Implementar un codi en Matlab per simular el comportament d'un ressonador aïllat.
4. Realitzar simulacions de filtres basades en aquests ressonadors.
5. Avaluar els beneficis potencials d'aquest mètode en comparació amb altres aproximacions.
6. Dur a terme mesures experimentals en ressonadors i filtres reals per validar la precisió de les simulacions.
 
Overview (resum en anglès):
This thesis presents the development of a new simulation methodology for analysing nonlinearities in electroacoustic devices, specifically Surface Acoustic Wave (SAW) resonators, Coupled Resonator Filters (CRFs), and Bulk Acoustic Wave (BAW) resonators. These devices, which play a critical role in telecommunications and aerospace systems due to their compactness and performance, exhibit nonlinear behaviour that leads to harmonic and intermodulation distortion. Accurately modelling these nonlinearities is essential for designing high-performance systems.

The project begins by analysing the existing Input Output Equivalent Source (IOES) method, which models nonlinear behaviour through distributed current sources within the device. Despite its accuracy, IOES presents drawbacks in terms of computational complexity and scalability. To address these limitations, a new method is proposed to simplify the nonlinear model by relocating and aggregating the nonlinear sources at the electrical terminals of the device. This simplification retains the distributed nature of the problem, while significantly reducing the complexity of the simulation.

The methodology is first applied and validated on SAW resonators, demonstrating improved simulation speed with minimal loss in accuracy. Then it is extended to CRF devices and BAW resonators. Comparative studies against IOES and experimental measurements confirm the method's reliability. Additionally, a Graphical User Interface (GUI) is developed to support circuit creation, simulation, and modification for SAW devices, with plans to include CRF and BAW technologies.

In conclusion, the new method offers a faster, scalable, and more manageable alternative to traditional nonlinear simulation techniques, paving the way for further research and integration into advanced design tools.

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