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Contribution to the Design of a Real-Time Fourier Transformer in Integrated Technology

Abstract : The constant increase of bandwidths and bitrates in everyday applications (e.g., telecommunications, internet of things), as also in more specialized applications (e.g., radar, radio astronomy observations), imposes stringent constraints in terms of speed, power consumption and heat dissipation at the analog-to-digital conversion stages of acquisition chains. Therefore, a current trend is to perform signal processing (e.g., Fourier transform) in the analog domain to be able to process ultra-wideband signals with low latency and in a more energy-efficient way. Many of the analog signal processing architectures rely on blocks that have not been widely explored in the literature: arbitrary group delay filters. These filters are generally realized in SAW technology or with discrete (non-integrated) microwave structures, leading to filters with limited bandwidth and high loss, in the case of SAW devices, or with a large size and weight, in the case of microwave filters. Very few integrated circuit implementations have been reported to date.The innovation presented in this thesis has two aspects, a system-level architectural aspect, which gave rise to the proposal for an analog Fourier transformer architecture that enables improve the precision performance when compared to the previously reported architectures, and an aspect concerning the development of linear group delay filter design methods and their implementation in an integrated circuit technology. Three different filter networks were designed using these methods, a minimum phase band-pass ladder filter, a balanced all-pass network with positive-slope linear group delay, and a balanced all-pass network with a linear group delay of negative slope. It has also been shown that the all-pass filters can be transformed into distributed amplifier-based transversal filters.
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Submitted on : Friday, February 28, 2020 - 5:23:08 PM
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  • HAL Id : tel-02494464, version 1

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João Alberto De França Ferreira. Contribution to the Design of a Real-Time Fourier Transformer in Integrated Technology. Micro and nanotechnologies/Microelectronics. Université Paris Saclay (COmUE), 2019. English. ⟨NNT : 2019SACLS502⟩. ⟨tel-02494464⟩

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