35 research outputs found
Design Of 3.3V Digital Standard Cells Libraries For Leon3
The scope of the research work was to develop 3.3Vdigital standard cell library for LEON3 operable at 200˚C using Peregrine 0.5m process. The dimension of the transistors was determined based on the work of Singravelan Vishwanathan. Layout and abstracted view were generated for the library. In total we have 259 cells. The cell library is characterized for timing and power data. The characterized data of the cells are documented in html format along with the lib format. The lib format file is used for synthesis and place and route.School of Electrical & Computer Engineerin
Layout optimization in ultra deep submicron VLSI design
As fabrication technology keeps advancing, many deep submicron (DSM) effects have become
increasingly evident and can no longer be ignored in Very Large Scale Integration
(VLSI) design. In this dissertation, we study several deep submicron problems (eg. coupling
capacitance, antenna effect and delay variation) and propose optimization techniques
to mitigate these DSM effects in the place-and-route stage of VLSI physical design.
The place-and-route stage of physical design can be further divided into several steps:
(1) Placement, (2) Global routing, (3) Layer assignment, (4) Track assignment, and (5) Detailed
routing. Among them, layer/track assignment assigns major trunks of wire segments
to specific layers/tracks in order to guide the underlying detailed router. In this dissertation,
we have proposed techniques to handle coupling capacitance at the layer/track assignment
stage, antenna effect at the layer assignment, and delay variation at the ECO (Engineering
Change Order) placement stage, respectively. More specifically, at layer assignment, we
have proposed an improved probabilistic model to quickly estimate the amount of coupling
capacitance for timing optimization. Antenna effects are also handled at layer assignment
through a linear-time tree partitioning algorithm. At the track assignment stage, timing is
further optimized using a graph based technique. In addition, we have proposed a novel
gate splitting methodology to reduce delay variation in the ECO placement considering
spatial correlations. Experimental results on benchmark circuits showed the effectiveness
of our approaches
THz: Research Frontiers for New Sources, Imaging and Other Advanced Technologies
The THz region of the electromagnetic spectrum is a frontier research area involving application of many disciplines, from outdoor to indoor communications, security, drug detection, biometrics, food quality control, agriculture, medicine, semiconductors, and air pollution. THz research is highly demanding in term of sources with high power and time resolution, detectors, and new spectrometer systems. Many open questions still exist regarding working at THz frequencies; many materials exhibit unusual or exotic properties in the THz domain, and researchers need new methodologies to exploit these opportunities. This book contains original papers dealing with emerging applications, new devices, sources and detectors, and materials with advanced properties for applications in biomedicine, cultural heritage, technology, and space
The design and use of a digital radio telemetry system for measuring internal combustion engine piston parameters.
During the course of this project, a digital radio telemetry system has been
designed and shown to be capable of measuring parameters from the piston of
an internal combustion engine, under load. The impetus for the work stems
from the need to sample the appropriate data required for oil degradation
analysis and the unavailability of system to perform such sampling.
The prototype system was designed for installation within a small Norton
Villiers C-30 industrial engine. This choice of engine presented significant
design challenges due to the small size of the engine (components and
construction) and the crankcase environment. These challenges were manifest
in the choice of carrier frequency, antenna size and location, modulation
scheme, data encoding scheme, signal attenuation, error checking and
correction, choice of components, manufacturing techniques and physical
mounting to reciprocating parts. In order to overcome these challenges detailed
analysis of the radio frequency spectrum was undertaken in order to minimise
attenuation from mechanisms such as, absorption, reflection, motion, spatial
arrangement and noise.
Another aspect of the project concerned the development of a flexible modus
operandi in order to facilitate a number of sampling regimes. In order to
achieve such flexibility a two-way communication protocol was implemented
enabling the sampling system to be programmed into a particular mode of
operation, while in use. Additionally the system was designed to accommodate
the range of signals output from most transducer devices.
The sampling capabilities of the prototype system were extended by enabling
the system to support multiple transducers providing a mixture of output
signals; for example both analogue and digital signals have been sampled.
Additionally, a facility to sample data in response to triggering stimuli has been
tested; specifically a sampling trigger may be derived from the motion of the
piston via an accelerometer.
Ancillary components, such as interface hardware and software, have been
developed which are suitable for the recording of data accessed by the system.
This work has demonstrated that multi-transducer, mixed signal monitoring of
piston parameters, (such as temperature, acceleration etc.) using a two-way,
programmable, digital radio frequency telemetry system is not only possible
but provides a means for more advanced instrumentation
Study of a common solar-electric-propulsion upper stage for high-energy unmanned missions. Volume 2 - Technical Final report
Versatile, multimission solar electric propulsion upper stage for high energy, unmanned interplanetary flights - technical detail
AROD test model hardware, volume 2 Final report
Engineering design data on vehicle-borne subsystems of airborne range and orbit determination syste
Gemini Program Launch Systems Final Report, Jan. 1962 - Dec. 1966
Management techniques used in development, systems test, and launching of Gemini launch vehicle, Gemini Agena Target Vehicle, and Atlas SLV-
Phototrophic Bacteria
Microorganisms is pleased to publish this book, which reprints papers that appeared in a Special Issue on “Phototrophic Bacteria”, with Guest Editors Robert Blankenship and Matthew Sattley. This Special Issue included research on all types of phototrophic bacteria, including both anoxygenic and oxygenic forms. Research on these bacterial organisms has greatly advanced our understanding of the basic principles that underlie the energy storage that takes place in all types of photosynthetic organisms, including both bacterial and eukaryotic forms. Topics of interest include: microbial physiology, microbial ecology, microbial genetics, evolutionary microbiology, systems microbiology, agricultural microbiology, microbial biotechnology, and environmental microbiology, as all are related to phototrophic bacteria