نتایج جستجو برای: pll
تعداد نتایج: 2263 فیلتر نتایج به سال:
در دنیای امروز، مدارات مجتمع به عنوان یک راهبرد، تاثیر بسیار زیادی روی پیشرفت سیستم های الکترونیکی داشته اند و توانسته اند با دستاوردهایی که در قسمت های مختلف، مجتمع سازی و فشرده سازی و بالا بردن دقت و سرعت سیستم ها و اجتماع سیستم های آنالوگ و دیجیتال در کنار هم، تحولی بزرگ در صنعت الکترونیک داشته باشند.از نمونه کارهایی که در روند مجتمع سازی این مدارات مشاهده می شود بحث شبیه سازی مدارات با ایده...
در این پایان نامه به بررسی نویز فاز و تاثیر آن بر عملکرد سیستم های مبتنی بر ofdm پرداخته شده است. برای این کار، ابتدا انواع مختلف نویز در مدارهای الکترونیکی بررسی شده و چگالی طیفی متناظر مطالعه می شود. در ادامه برای بیان تاثیر نویز در ایجاد نویز فاز، انواع مختلف اسیلاتورهای آزاد و نحوه طراحی آنها و همچنین نویز فاز مربوط به هر قسمت بررسی می شود. همچنین راهکارهای ممکن برای کاهش مقدار نویز فاز در ...
A fast two-vector Phase-locked loops (PLL) control has been proposed to the phase and frequency of grid voltage using 48-pulse switching. The novel controller senses shift as a deviation by load locked positive sequence. was designed track angle kept within satisfying rang at all time. PI- obtain desired performance PLL. PLL voltage. test results shows that new design can response sequence betw...
Based on a practical long-distance large-capacity transmission engineering case, the small-signal stability of fractional frequency system (FFTS) with Y-connected modular multi-level converter (Y-MMC) is mainly researched in this paper. Different from previous control strategies Y-MMC, paper establishes decoupling mathematical model and proposes strategies. Then, Y-MMC obtained. Considering exi...
The aim of this study was to obtain accurate angular positions and velocities from resolver signals; resolver-to-digital conversion (RDC) often adopts a phase-locked loop (PLL) as demodulation algorithm. However, signals come with quadrature errors harmonics, which lead severe reduction in PLL accuracy. conventional does not consider the impact error, bandwidth is much larger than fundamental f...
tIapten conjugates of synthetic poly amino adds are useful tools for the investigation of the metabolism of antigen, which is an early step in the immune response. Previous studies have shown that approximately 25 per cent of random-bred guinea pigs and 100 per cent of the highly inbred strain 2 guinea pigs are capable of developing an immune response to lightly coupled hapten-poly-L-lysine (PL...
In order to improve the water-solubility and long-term antibacterial activity of copper nanoparticles (CuNPs), a poly-L-lysine-modified reduced graphene oxide (PLL-rGO) was used as the carrier of CuNPs, and a poly-L-lysine/reduced graphene oxide/copper nanoparticles (PLL-rGO-CuNPs) hybrid was prepared by anchoring the CuNPs on the reduced graphene oxide surface. The novel PLL-rGO-CuNPs hybrid w...
In this paper, a systematic overview of PLL-based closed-loop control methods for interleaved DCM/CCM boundary boost PFC converters is presented. It is shown that the PLL-based closed-loop methods always provide stable operation, unlike the open-loop control methods, where the only method which results in stable operation is the slave synchronization to the turn-on instant of the master with cu...
To increase the encapsulation of hydrophilic antitumor agent daunorubicin (DNR) and multidrug resistance reversal agent tetrandrine (Tet) in the drug delivery system of nano-particles (NPs), a functional copolymer NP composed of poly(lactic-co-glycolic acid) (PLGA), poly-L-lysine (PLL), and polyethylene glycol (PEG) was synthesized and then loaded with DNR and Tet simultaneously to construct DN...
Security of cryptographic systems depends significantly on security of secret keys. Unpredictability of the keys is achieved by their generation by True Random Number Generators (TRNGs). In the paper we analyze behavior of the Phase-Locked Loop (PLL) based TRNG in changing working environment. The frequency of signals synthesized by PLL may be naturally influenced by chip temperature. We show w...
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