نتایج جستجو برای: frequency standard
تعداد نتایج: 971975 فیلتر نتایج به سال:
Abstract In order to achieve wide-band high-resolution frequency measurement, a synchronization detection method based on adaptive standard tracking is proposed the quantized phase processing. First, nominal value of measured signal was obtained from rough measurement module. Then, field programmable gate array generated frequency. After that, direct comparison between and carried out. Finally,...
the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...
The load frequency control system aims to regulate the in electric power at a normal value with predetermined tolerance limit. In practice, does not always operate optimally, therefore controller is needed be added system. designed variation of combination Proportional-Integral-Differential (PID) controllers standard model PIDTune method consisting proportional (P) controller, integral (PI) dif...
a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...
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