196,019 research outputs found
Interlaced diagonal-wise pipelined serial multiplier
No full textA new two's complement serial multiplier based on a pipelined diagonal-wise interlaced structure is presented. Two N x M multiplications are processed simultaneously, which is particularly useful for a high-throughput area-efficient complex number multiplier. Using the proposed scheme, an 8 x 8 bit complex multiplier prototype was realised in 0.25 mum standard cell CMOS technology with 1.6 Kgates complexity for a maximum operating frequency of 550MHz
FAST: FFT ASIC Automated Synthesis
No full textIn this paper, an automated design method for the synthesis of a high-throughput fast Fourier transform (FFT) ASIC is presented, applicable to any power-of-two FFT sizes. The method is based on a C++ program named FAST which has been developed. as a friendly dialogue-window interface to help the designer, first to obtain a bit-true FFT architecture to attain the desired precision performance and then to derive validated gate-level netlists for the selected silicon technology. As a result, a substantial reduction of the design time is achieved. The FFT processor implements a mixed 2/4 radix algorithm with a Cascade Bi and Jones architecture. The relevant VLSI design is based on a parametric, highly flexible VHDL description created using a design-reuse approach. According to the FAST methodology, two prototypes (64- and 1024-point FFT processors) have been developed resulting very interesting in terms of hardware complexity and precision performance when compared with state of the art; in particular, the 64-point FFT processor exhibits an area-time product nearly 30% lower than previous works following automatic-design methodologies. (C) 2002 Elsevier Science B.V. All rights reserved
Single-chip mixed-radix FFT processor for real-time on-board SAR processing
No full textReal-time Earth observation has become essential for many applications such as natural disasters monitoring, coastal maritime surveillance and winter navigation in polar seas. In this respect the European Space Agency (ESA) has recently proposed the so called on-board SAR processing system (OSPS) which needs powerful real-time DSP and FFT processors to be implemented in rad-hard technology. In this paper a VLSI single chip programmable FFT processor suitable for the ESA OSPS is presented. The FFT processor is able to process 32, 64, 128 and 256 complex points FFT, with an input data rate of 50 Mcomplexsample/s. For low-cost proof-of-concept prototyping the chip was designed in 0.6 μm CMOS technology yielding an overall core area of 36.09 mm2 for about 43 Kgate and demonstrated to be fully functional by extensive computer simulation
Design, testing and prototyping of a software programmable I2C/SPI IP on AMBA bus
No full textWhile power consumption and area occupation are always critical constrains in System-on-Chip design, at the same time high communication flexibility is required, due to proliferation of communication protocols. In this work a novel architecture for an I2C/SPI interface for APB AMBA bus is presented, showing how it is possible to merge flexibility and reduced area occupation. Large part of this work is centered on the testing and FPGA prototyping of this IP. CMOS synthesis results on 0.18 μm standard cell library are also presented
Dynamic modelling of tram-induced vibration on the temple of minerva medica in rome
No full textThe passage of trams in urban areas is a source of cyclic vibration which can induce damages in buildings close to the track. This aspect is even more relevant in the case of historical buildings and monuments because of their intrinsic fragility and the importance of preserving them as unaltered as possible for the next generations. In this framework, the purpose of this paper is the development of a mathematical modelling, based on experimental measurements, for the numerical simulation of vibration due to tram passages close to the so-called temple of Minerva Medica in Rome. The vibration signals were recorded at some points on ground level and on the structure by the use of GPS synchronized seismographs equipped with triaxial velocimeters. By means of spectral analysis of the acquired data, time windows associated to each tram passage have been assumed as stochastic nonstationary processes characterized in terms of energy and dominant frequencies by an evolutionary power spectral density. The signals acquired at different points due to the same passage define a multivariate process. The model would like to allow the simulation of the input at the base of the monument and the evaluation, through finite element analysis, of the exposure of the structure to cyclic stresses under different amplitudes highlighting the probability and location of damages in time
Mixed Signal Behavioral Verification using VHDL-AMS
No full textIn this paper we describe a methodology to set up a behavioral verification for complex mixed-signal System-on-Chip (SoC). The verification flow, consisting in VHDL-AMS modeling of the analog and mixed-signal section of a generic system, is depicted. This methodology has been successfully adopted for the top level debugging of a mixed signal SoC for sensor interface
Non-invasive analyses of a multi-stratified archaeological and historical site: The Crypta Balbi case-study
No full textA number of non-invasive techniques were used to study the state of conservation of an important archaeological site in the centre of Rome, the Crypta Balbi (part of the Museo Nazionale Romano), so-called after proconsul Lucio Cornelio Balbo, who in the year 13 BC built here a theatre in the Campus Martius [1]. Excavations are still ongoing, so new relevant archaeological findings could still be discovered. At the same time, this involves that each new finding must be conserved and preserved. To this aim, extensive monitoring campaigns are essential. The reconstructions in Figure 1 and 2 show the structure of the monument during the II century (imperial age) and after, until the 15th century [1]. Figure 3 shows the studied site as it is today. The theatre and the Crypta (a kind of courtyard) are located within the red dotted circles. Today it is close to a tramway in the city centre, that induces air pollution and vibrations potentially putting at risk this unique archaeological site. In order to study its various layers, a number of non-invasive techniques have been used. Among them: infrared cameras for the thermographic analysis, velocimeters to evaluate impact of vibrations, microclimatic parameters acquisition, kinematic analysis, digital video elaboration by motion magnification method. Substantially, this monitoring campaign was based on non-contact investigations in order to eliminate any danger to damage the elements of the monument, which provided useful insights. Thermal images of the monument were captured using a Flir T440 thermal infrared camera. Microclimatic parameters and data of weather stations were collected for correlation to experimental ambient vibration and NDTs data. In particular, air temperature and humidity were monitored by two MSR145 mini data loggers. Seismographs type SL06 SARA Instruments digital recorders equipped with SS02 triaxial velocimeters were used for the vibration monitoring. Each seismograph is independent and provided with battery for the energy supply and with a GPS antenna for synchronization, so that data from different instruments can be compared in the time domain. The instrumentation is very accurate, in fact the sensitivity is 400 V/m/s and the frequency range from 0.2 to 50 Hz, sampling frequency set at 200 Hz. Data were acquired from 10:00 a.m. to 12:00 a.m. Motion Magnification (MM) is a recently developed video processing methodology [2, 6, 5]. MM [2 - 6] acts like a microscope in digital videos, magnifying motions hardly visible with the naked eye, but leaving unchanged the topology of the images
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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