Conception de circuits RF en CMOS SOI pour modules d’antenne reconfigurables

Dominique Nicolas 1
1 LAAS-MOST - Équipe Microondes et Opto-microondes pour Systèmes de Télécommunications
LAAS - Laboratoire d'analyse et d'architecture des systèmes [Toulouse]
Abstract : In the context of mobile applications, the design constraints of the increasingly sophisticated transmission chains and of reduced size require to compensate for the high sensitivity of the characteristics of the antennas to their environment. In particular, it is necessary to control the impedance of the antenna in order to optimize the energy efficiency of the transmission chain. However, current solutions are cumbersome. In this thesis, several tracks based on the implementation of variable capacitors have been studied and led to the realization and characterization of new integrated RF devices able to participate in this effort. After a presentation of the context and the state of the art, we propose a study of variable capacitors based on the technique of switched capacitors. The study has made it possible to produce two variable capacitors in 130 nm CMOS SOI technology for impedance matching and agile frequency antenna applications. A first frequency-agile slot antenna demonstrator targeting LTE bands between 500 MHz and 1 GHz and using this type of capacitor was then carried out and validated. A tuning system to correct the antenna mismatches was then studied and resulted in the realization of two integrated circuits in 130 nm CMOS SOI technology. The first circuit is an impedance detector capable of operating over an extended power range of 0-40 dBm for a frequency range of 600 MHz-2.5 GHz. The second circuit incorporates an improved version of the detector with a variable adaptation circuit enabling the realization of an autonomous and compact antenna tuning system representing a significant advance in relation to the state of the art.
Document type :
Theses
Micro et nanotechnologies/Microélectronique. Université Paul Sabatier (Toulouse 3), 2017. Français
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Submitted on : Thursday, September 21, 2017 - 3:41:31 PM
Last modification on : Thursday, January 11, 2018 - 2:04:27 AM

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Dominique Nicolas. Conception de circuits RF en CMOS SOI pour modules d’antenne reconfigurables. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier (Toulouse 3), 2017. Français. 〈tel-01591595〉

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