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  • Artigo de evento
    Halo effects on 0.13 μm floating-body partially depleted SOI n-Mosfets in low temperature operation
    (2003-10-12) MARTINO, J. A.; Marcelo Antonio Pavanello ; SIMOEN, E.; CLAEYS, C.
    This work studies the effect of halo implantation on the electrical characteristics of deep-submicrometer partially depleted SOI nMOSFETs during low temperature and floating body operation, Parameters such as the Drain Induced Barrier Lowering and the device thermal resistance have been investigated. It is shown that the combination of floating body operation with halo implantation degrades the DIBL in the temperature range studied (90 - 300 K) in comparison to devices that did not received this implantation. The halo region causes a more pronounced negative output conductance than for the transistors without a halo implantation. An estimation of the temperature rise for a given dissipated power in both types of devices is made, based on the thermal resistance, which is derived from the output characteristics in function of the temperature.
  • Artigo de evento
    Operation of double gate graded-channel transistors at low temperatures
    (2003-10-16) Marcelo Antonio Pavanello ; MARTINO, J. A.; CHUNG, T. M.; KRANTI, A.; RASKIN, J. P. ; FLANDRE, D.
    This work studies the use of graded-channel profile on double gate SOI MOSEETs from room temperature down to 95 K with the aim of studying the analog performance. Two-dimensional simulations are performed to provide a physical explanation for the improved analog device characteristics given by the double gate graded-channel MOSFETs. It is demonstrated that double gate graded-channel MOSFETs can provide extremely improved Early voltage, high transconductance and drive current in comparison to the conventional double gate fully depleted SOI MOSFETs with similar dimensions. A degradation in the Early voltage as the temperature decreases has been found but this reduction reflects negligibly in the low frequency open loop gain for a temperature range of 150 K to 300 K due compensation provided by the transconductance to drain current ratio.
  • Artigo de evento
    Stocks classification using fuzzy clustering
    (2004-06-21) Renato Aguiar ; SALES, R. M. ; DE SOUSA, L. A.; IMONIANA, J. O.
    The main objective of this paper is to investigate the application of a pattern recognition technique as a supporting tool for stock investment decision taking by the public companies in the Brazilian Stock Market. The technique, known as fuzzy clustering means is applied to a set of indexes extracted from the quarterly financial statements relating to the 4 th quarter of 1994 through the 2nd quarter of 2002 belonging to oil/petrochemical and textile companies. The technique separates a group of companies into two sets. Having a set with higher potential returns than the other. And besides that, the set of stocks of the companies produced a higher potential yields and an average financial returns closer to the Bovespa index.
  • Artigo de evento
    An improved model for the triangular SOI misalignment test structure
    (2004-09-07) Renato Giacomini; MARINO, J. A.
    The triangular misalignment test structure is an arrangement of MOS transistors to calculate the poly and source/drain diffusion misalignment as a function of drain current differences. Although these structures have non-rectangular shapes, which may be detrimental for the design, the advantage of measuring currents instead of voltage differences make them very useful. This work presents a new analytic misalignment error model for thin-film, fully depleted SOI technology, using non rectangular devices. Three-dimensional numerical simulation is used as a reference for models comparison and verification. These simulation results show that the proposed analytical model presents an improved performance compared to those available in the literature.
  • Artigo de evento
    Distributed DSP processing for multivariable state equations
    (2004-08-04) Fabrizio Leonardi ; MELO, M. A. A. DE ; LA NEVE, A.
    This work deals with the synthesis of a multivariable digital controller when its hardware must be decentralized. Thus, it can be used as a way to implement dynamic equations in state space for hardware with limited inputs and outputs. The method consists in breaking equations, while keeping the overall transfer matrix, resulting in a distributed implementation. The solution has a modular structure for an arbitrary number of inputs and outputs. It is shown a way to perform the synthesis by using the same dynamic matrix. As a consequence the computational demand could not be severely reduced when compared with a centralized controller. Nevertheless, the synthesis is actually distributed since each part is implemented with a smaller number of inputs and outputs. A multivariable controller of an inverted pendulum is used as an example. ©2004 IEEE.