direct digital frequency synthesizer中文什么意思

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直接式數(shù)字頻率合成器

direct: adj. 1.筆直的，一直線的；正面的。 2.直接的。 ...
digital: adj. 1.手指的；指狀的。 2.數(shù)字的，數(shù)據(jù)的。 n ...
frequency: n. 1.屢次，頻仍，頻繁。 2.(脈搏等的)次數(shù)，出現(xiàn) ...
synthesizer: n. 合成者，合成物；〔尤指〕【電學(xué)】合成器，綜合器。
dds direct digital synthesizer: 直接數(shù)字合成器

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Study on direct digital frequency synthesizer technology based on piecewise pperation
基于分段運(yùn)算的直接頻率合成技術(shù)研究
At first , this paper described the basic structure , working principle , sources of spurious signals and characteristics of output spectrum , of direct digital frequency synthesizer ( dds )
首先分析直接數(shù)字頻率合成器( dds )的基本結(jié)構(gòu)、工作原理、雜散來(lái)源、輸出頻譜特性。
Direct digital frequency synthesizer ( dds ) is an apparatus to generate wave on the required frequency . it provides high frequency resolution , rapid frequency transforma - tion and other superiority
直接數(shù)字頻率合成器是現(xiàn)代頻率合成的主要工具,它有頻率分辨率高,頻率轉(zhuǎn)化快等眾多優(yōu)點(diǎn)。
Then according to the emphasis of the design , went deeply into the theory of pll frequency synthesizers widely used , described pll ’ s working principle , structure and several types in detail , and made research and analysis of pll frequency synthesizers ’ phase noise , including the effect of the active loop filter on the phase noise , and give some methods to make improvement as well , such as changing loop filter form , reducing divide number , and increase phase detector frequency , etc . then paper introduced the principle character and phase noise analysis of direct digital frequency synthesizer ( dds ) and injection phase lock circuit , which are also important circuits in the design
論文首先對(duì)幾十年頻率合成器的發(fā)展進(jìn)行概述,而后針對(duì)本次設(shè)計(jì)的重點(diǎn),對(duì)應(yīng)用較為廣泛的鎖相頻率合成理論進(jìn)行了深入的探討,詳細(xì)介紹了鎖相環(huán)的工作原理、組成結(jié)構(gòu)和鎖相類型,并對(duì)鎖相頻率合成器的相噪特性進(jìn)行了研究分析,包括有源環(huán)路濾波器對(duì)于相噪的影響,提出了改善相位噪聲的幾點(diǎn)措施:改善環(huán)路形式、降低分頻數(shù)、增大鑒相頻率等。接著介紹了直接數(shù)字頻率合成器( dds )和注入鎖相電路的原理特點(diǎn)以及相噪分析,它們也是本次設(shè)計(jì)的重要電路。
The direct digital frequency synthesizer is a kind of fully digitized frequency synthesizer , which consists of the phase accumulator , the sine look - up table , the digital to analog converter and the low band filter . it is of high frequency resolution , fast frequency switching speed , low phase noise , the ability to switch frequencies while maintaining constant phase , and the ability to producing arbitrary waveforms
直接數(shù)字頻率合成器是一種全數(shù)字化的頻率合成器，由相位累加器、波形rom 、 d a轉(zhuǎn)換器和低通濾波器構(gòu)成， dds技術(shù)具有頻率分辨率高、頻率切換速度快、頻率切換時(shí)相位連續(xù)、輸出相位噪聲低和可以產(chǎn)生任意波形等優(yōu)點(diǎn)。

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direct digital frequency synthesizer中文什么意思

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