預放大噪聲 的英文怎麼說
中文拼音 [yùfàngdàzàoshēng]
預放大噪聲
英文
preamplifier noise-
Secondly, compared with some other kinds of comparator structure and based on the preamplifier - latch fast - compare theory, a novel topology of cmos preamplifier latch comparator circuit is presented. considering trade - off between kickback noise and power dissipation, reference resistance value is optimized. according to the encode demands of different stage resolution, clock - control encode circuit is designed
其後，在具體的子adc設計中，對比各比較器類型的優缺點，並基於預放大鎖存快速比較理論，提出一種新型高速低功耗預放大鎖存比較器電路拓撲;根據adc系統所允許的參考電壓最大波動限制，在回饋噪聲對輸入參考電平的影響和功耗之間折衷，確定優化的參考電阻串阻值;根據不同級精度的編碼要求，設計出時鐘控制編碼電路。Then we introduce the character of the atmosphere channel, which we emphasized on the atmosphere scatter, absorption and scintillation ' s effect on the laser beam. in chapter, we explain why we used cassegrain telescope to collect the optical signal at first, then the lightsource, detector, front amplifier used in optical communication has been compared to that of fiber communication, the noise including shot noise, thermal noise and background light noise has been explained here for analysis the snr and ber in the next section
在第三章介紹無線光接入系統的光收發單元，採用多孔徑卡塞格倫式的收發天線對消除減小大氣湍流影響有較大作用，針對大氣通道的特點無線光系統收發單元在光源、光探測器、前置放大電路上存在許多有別于光纖通信的技術，同時還闡述了光接收機包括背景噪聲的噪聲機制和接收靈敏度、誤碼率等指標，最後給出了一個整個傳送鏈路的功率預算。Secondly, a method which can prejudge the gain and noise figure of the low noise amplifier ( lna ) is put forward. with this method, we can prejudge the feasibility of lna design once the s - parameter and noise parameter of the device are gained. the design process is considerably simplified compared with traditional methods
隨后對低噪聲放大器進行了探討，提出了一種可預測增益和噪聲系數的方法，只要知道器件的s參數和噪聲參數，就能對放大器設計的可行性進行預測，相對于傳統作法，設計過程得到了大大簡化。The present research status and some methodologies about the 3d reconstruction and visualization are introduced in this paper, while three important contents, i. e., image pre - processing, 3d reconstruction and 3d reveal are more concerned. image pre - processing includes interpolating, filtering, gray adjusting, rotating, zooming, selecting voi and reducing elements which are very important for the next step. the work of this paper use marching cubes ( mc ) algorithm to reconstruct the 3d object after analyzing the volume rendering method and the surface rendering method
在二維圖像預處理方面討論了濾波、灰度修正、旋轉和縮放、感興趣區域voi （ volumeofinterest ）的提取、減少體數據集中象素的數目、層間插值等，這些處理可以減少噪聲的干擾，使物體的特徵更加突出、需要處理的數據大大減少、節省存儲空間、加快繪制速度，這些處理對於後一步的三維重建是非常必要的；在三維重建方面，分析了面繪制和體繪制各自的優點和缺點，選取了面繪制中經典的mc演算法實現三維重建；在三維顯示中實現對體數據的顯示、剝離顯示、旋轉、等值面顯示、沿x 、 y軸的剖切顯示、光照顯示等效果。分享友人