نتایج جستجو برای: direct digital synthesis

تعداد نتایج: 1109471  

2013
Tiago da Silva Almeida Ian Andrew Grout

The top-down methodology and CAD tools are important in development of electronic circuits. Mainly when design is in high level of abstraction and many levels of representation can be used to modeling the electron ic circuits. Th is way is necessary to use a tool to execute the synthesis of models, i.e ., changing a representation in high level of abstraction in another in lower level. This pap...

L Khojastepour M Jazayeri, M Omidi, S Mohammadzadeh

Background: Jaw bone quality plays an essential role in treatment planning and prognosis of dental implants. Regarding several available methods for bone density measurements, they are not routinely used before implant surgery due to hard accessibility.Objective: An in vitro investigation of correlation between average gray scale in direct digital radiographs and Hounsfield units in CT-Scan pro...

Journal: :journal of sciences islamic republic of iran 0

three high-silica mordenite zeolites differing in sio440, ratio were prepared by direct synthesis without using any template. the products si02/a120, ratio is influenced by the starting gel composition. this ratio is increased upon ion-exchange with nh,cl and subsequent calcination to prepare protonic mordenite. the protonic mordenites with si02/a1203ra tios of 14.6,29.2 and 34.6 were character...

Journal: :IEEE Photonics Journal 2022

Recent research in Phase-Sensitive Optical Time Doman Reflectometry (ϕ-OTDR) has been focused, among others, on performing spatially resolved measurements with various methods including the use of frequency modulated probes. However, conventional schemes either rely phase-coded sequences, involve inflexible generation probe modulation or mostly employ simple linear (LFM) pulses which suffer fro...

Journal: :IEEE Transactions on Very Large Scale Integration (VLSI) Systems 2018

Journal: :International Journal on Intelligent Electronic Systems 2016

Journal: :IPTEK Journal of Proceedings Series 2014

2015
Zhanpeng Jiang Rui Xu Hai Huang Changchun Dong

DDFS (Direct Digital Frequency Synthesizer) is a new technique of frequency synthesizes which introduces the advanced digital processing theory into frequency synthesis. A direct digital frequency synthesizer is composed of a phase accumulator, an adder, an ROM for wave pattern saving, a D/A converter and a LPF (low pass filter). With the rapid development of VLSI, the speed of algorithm is req...

Journal: :Transactions of the Society of Instrument and Control Engineers 1973

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