RF QUADRATURE OSCILLATORS
Nowadays, the demand for mobile and portable equipment has led to a large increase in wireless communication applications. Modern transceiver architectures, to achieve full integration and low cost, require quadrature oscillators with very accurate quadrature relationship, since quadrature errors affect strongly the overall performance of the RF (Radio Frequency) front-end. Relaxation oscillators are known for their poor phase-noise performance. Here we show that, by cross-coupling two oscillators, the phase-noise performance is improved. Moreover, strong coupling reduces the effect of mismatches and other disturbances: these are attenuated by the feedback, becoming second order effects, and this guaranties a very accurate quadrature. LC oscillators are known for their good phase-noise performance when compared with relaxation oscillators. In a cross-coupled LC oscillator, coupling is necessary for accurate quadrature in the presence of mismatches; however, this degrades the oscillator phase-noise, due to the degradation of the quality factor.
Date: 2007-Feb-15 Time: 14:00:00 Room: 425, 4th stage at INESC-ID
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Workshop “Metabolism and mathematical models: Two for a tango” – 2nd Edition
Title: Workshop Metabolism and mathematical models: Two for a tango – 2nd Edition
Dates: October 25-26, 2022
Location: This workshop will be held in a virtual way
The topic of this workshop is metabolism in general, with a special focus, although not exclusive, on parasitology. Besides an exploration of the biological, biochemical and biomedical aspects, the workshop will also aim at presenting some of the mathematical modelling, algorithmic theory and software development that have become crucial to explore such aspects.
This workshop is being organised in the context of two projects, both with the Inria European Team Erable. One of the projects involves a partnership with the University of São Paulo (USP), in São Paulo, Brazil, more specifically the Institute of Mathematics and Statistics (IME) and the Institute of Biomedical Sciences – Inria Associated Team Capoeira – and the other involves the Inesc-ID/IST in Portugal, ETH in Zürich and EMBL in Heidelberg – H2020 Twinning Project Olissipo.
The workshop is open to all members of these two projects but also, importantly, to the community in general.
The program and more details are available here.