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Conception d'interfaces boitiers innovantes pour le radar automobile 77-GHz : Application à la conception optimisée d'une chaine de réception radar en boitier

Abstract : The development of automotive radars, at the frequency band 76-77 GHz, has experienced a significant growth over the last decade. Ongoing developments have to cope with two main challenges. The first challenge is reducing the cost to equip more car categories with these radars. The second challenge is to improve radar performance in order to satisfy the increasing demands of the road safety authorities and to equip the autonomous car. The automotive radar transceiver is the masterpiece of the system. Therefore, significant pressure is exerted on the semiconductor suppliers to develop next generation radars with superior performances and at lower cost than previous generations. Improving the radar transceiver performances requires improving these four main parameters: Noise Figure (NF), Power Amplifier (PA) power, Phase Noise (PN) and heat dissipation. Lowering the cost can be achieved by reducing test time, chip and PCB sizes, and wafers and package costs. We propose, in this work, a reduction of package cost and PCB size and improvement of heat dissipation by using a FI-WLP. The Wafer Level Chip Scale Package (WLCSP), the best known FI-WLP, was chosen for this application. It is the first time, in Silicon semiconductors history, that a FI-WLP is used at such high frequencies. The first chapter describes the radar system in general and its main components. It focuses on the contribution of the transceiver then the package to the radar performances. The second chapter provides a methodology for EM models validation based on the modeling and experimental validation of passive structures on-chip. Innovations, significantly improving the WLCSP electrical performances, are revealed in the third chapter. The characterization of WLP is, itself, a challenge and novel methodologies to perform it are proposed in the same chapter. Thereafter, a new WLCSP packaged mixer, where block core and RF input matching are co-optimized, is designed and presented in the fourth chapter. The obtained NF is at the state-of-the-art, whereas the very constraining FI-WLP is used. All WLCSP transition and mixer simulation results are validated through measurement. This characterization confirms the excellent performances expected from this novel package and circuit designs.
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Submitted on : Friday, December 1, 2017 - 11:16:13 AM
Last modification on : Thursday, March 5, 2020 - 4:36:20 AM

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  • HAL Id : tel-01653231, version 1

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Charaf-Eddine Souria. Conception d'interfaces boitiers innovantes pour le radar automobile 77-GHz : Application à la conception optimisée d'une chaine de réception radar en boitier. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30010⟩. ⟨tel-01653231⟩

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