Publications

Publications by CTM

2005

Progressive on-the-fly test method

Authors
Mamede, J; Carrapatoso, E; Ricardo, M;

Publication
AC 2005, Proceedings of the IADIS International Conference on Applied Computing, Algarve, Portugal, February 22-25, 2005, 2 Volumes

Abstract

2005

Protocol conformance using a progressive test approach

Authors
Mamede, J; Carrapatoso, E; Ricardo, M;

Publication
PROCEEDINGS OF THE SECOND IASTED INTERNATIONAL MULTI-CONFERENCE ON AUTOMATION, CONTROL, AND INFORMATION TECHNOLOGY - COMMUNICATION SYSTEMS

Abstract
The development of communications systems demands testing. This paper presents a framework for testing on-the-fly, which relies on the definition of 3 types of tests and on their sequential execution. The ioco conformance relation was considered in order to assign verdicts. A tool prototype is also presented that supports the proposed framework. This tool, named PROFYT, was developed based on the SPIN verifier, and uses communicating FSMs to describe the specification. The test of Conference Protocol implementations was carried out on-the-fly with PROFYT and enabled us to conclude about the benefits of the test methodology proposed.

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2005

Differential Gain and Phase Testing

Authors
Silva, JM; Mendonça, H;

Publication
The International Series in Engineering and Computer Science - Dynamic Characterisation of Analogue-to-Digital Converters

Abstract

2005

Comparative Study of ADC Sinewave Test Methods

Authors
Silva, JM; Mendonça, H; Mazoleni, S;

Publication
The International Series in Engineering and Computer Science - Dynamic Characterisation of Analogue-to-Digital Converters

Abstract

2005

ADC Applications, Architectures and Terminology

Authors
Silva, JM; Mendonça, H;

Publication
The International Series in Engineering and Computer Science - Dynamic Characterisation of Analogue-to-Digital Converters

Abstract

2005

Programmable analogue VLSI implementation for asymmetric sigmoid neural activation function and its derivative

Authors
Tabarce, S; Tavares, VG; de Oliveira, PG;

Publication
ELECTRONICS LETTERS

Abstract
A new CMOS VLSI implementation of an asymmetric programmable sigmoid neural activation function, as well as of its derivative, is presented. It consists of two coupled PMOS and NMOS differential pairs with different programmable bias currents that set the upper and lower limits of the sigmoid. The circuit works in the weak inversion region, for low power consumption and exponential envelope, or in strong inversion to achieve higher speeds. The results obtained from the theoretical transfer function, and from the simulations of the circuit implemented in AMI's 0.35 mu m technology, show a very good match.

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