João M. S. Silva

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Modern deep sub-micron ultra-large scale integration designs with hundreds of millions of devices require huge grids for power distribution. Such grids, operating with decreasing power supply voltages, are a design limiting factor and accurate analysis of their behavior is of paramount importance as any voltage drops can seriously impact performance or(More)
Modern deep sub-micron ULSI designs with hundreds of millions of devices require huge grids for power distribution. Such grids, operating with increasingly low-power voltages, are a design limiting factor and accurate analysis of their behavior is of paramount importance as any voltage drops can seriously impact performance or functionality. As power grid(More)
In modern monolithic integrated circuits, substrate coupling is a major concern in mixed-mode systems design. Verification of such systems implies the availability of accurate and simulation-efficient substrate coupling models. For frequencies up to a few pure resistive models are considered sufficient, but increasing frequencies of operation imply that(More)
Accurate modeling of coupling effects via the substrate is an increasingly important concern in the design of mixed-signal systems such as communication, biomedical and analog signal processing circuits. Fast-switching digital blocks inject noise into the common substrate hindering the performance of high-precision sensible analog circuitry. Miniaturization(More)
Reduced order modeling is a well-known methodology for linear system modeling. In the past decade it has risen to prominence in the VLSI electronic design area as the de facto standard set of techniques for interconnect and package modeling. With shrinking technologies and faster operating frequencies, such previously ignored structures can have a first(More)
OBJECTIVE To evaluate the prevalence of genu valgum and associated factors in elementary school students. METHODS Cross-sectional study, carried out in 2015, with 1,050 children and adolescents enrolled in an elementary school in Santos, Southeast Brazil. Misalignment of the knee was assessed by intermalleolar distance, considering ≥8 cm or <8 cm.(More)
The simulation of power distribution networks is a difficult task owing to the large number of elements and ports in such circuits. In this work, the authors elaborate on the compressibility of power grid models. For this purpose, two main options are available, namely sparse or hierarchical model representations of such systems and equivalent reduced order(More)
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