例句與造句

1. 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
   論文首先對幾十年頻率合成器的發(fā)展進行概述,而后針對本次設計的重點,對應用較為廣泛的鎖相頻率合成理論進行了深入的探討,詳細介紹了鎖相環(huán)的工作原理、組成結(jié)構(gòu)和鎖相類型,并對鎖相頻率合成器的相噪特性進行了研究分析,包括有源環(huán)路濾波器對于相噪的影響,提出了改善相位噪聲的幾點措施: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以及相噪分析,它們也是本次設計的重要電路。
2. It's difficult to find active loop in a sentence. 用active loop造句挺難的