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Theses

Étude et conception d'une nouvelle architecture de déphaseur actif à 24 GHZ en technologie BiCMOS SIGE : C 0,25 µm pour la formation de faisceaux

Abstract : The work presented in this thesis consists in designing an original integrated circuit in the millimetre-wave domain. Associated to an antenna array, this circuit performs beamforming, i.e. it allows the orientation and control of the radiation pattern in the desired direction. In millimetre waves, the ability to steer the beam allows to compensate for the losses due to the increase in frequency. This new circuit ensures a tunable RF phase shift between the input and the output. It is based on an original Injection Locked triple-push Voltage Controlled Oscillator (VCO) at 8 GHz. In these conditions, the frequency of the output signal is at 24 GHz. The objective of this dissertation is to design this fully integrated active RF phase shifter implemented in the QUBiC4X 0.25 µm SiGe:C BiCMOS process of NXP semiconductors. In the first part of this work, the design of this new architecture of a differential «triple-push» VCO at 24 GHz is presented. This «triple-push» VCO consists of three differential VCOs coupled through varactor diodes. The post layout simulation results validate the design methodology with an excellent level of fundamental and second harmonic rejections. Then, a novel architecture of an 8 GHz differential 120° tuneable phase shifter is presented. This phase shifter allows to obtain, from a single-ended input signal, three 120° out of phase signals with the same amplitude. The circuit was implemented on the same process and various post-layout simulation results were reported. Finally, the global circuit is designed and implemented, combining the 120° phase shifter and the «triple-push» VCO. The latter is injection locked by the 120° phase shifter. The post-layout simulations results validate the proposed original approach of the designed circuit and show a linear variation of the phase shift throughout the entire phase plane. This active phase shifter is intended to be associated to an elementary antenna to subsequently constitute a complete antenna array that can be used for data transmission, for example in 5G technology.
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Bhanu Pratap Singh Jadav. Étude et conception d'une nouvelle architecture de déphaseur actif à 24 GHZ en technologie BiCMOS SIGE : C 0,25 µm pour la formation de faisceaux. Electronique. Université de Poitiers, 2019. Français. ⟨NNT : 2019POIT2320⟩. ⟨tel-03463684⟩

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