band switching 中文意思是什麼
band switching
解釋
【無線電】波段轉換。-
Band switching diode
波段轉換開關二極體 -
Band switching circuit
波段轉換電路 -
Duo to the intrinsic characteristics of the gaas material, serai - insulating ( si ) gaas photoconductive semiconductor switches ( pcss " s ) have more obvious advantages in the performance of both high power and ultra - fast switching than those pcss " s made of other materials and then can be widely used in ultrahigh speed electronics, field of high power microwave generation and pulse forming ( pulse sources of high power ultra - fast electromagnetism, ultra - wide - band microwave generator )
半絕緣gaas光電導開關（ photoconductivesemiconductorswitches簡稱pcss ' s ）具有兼備寬頻帶和高功率容量特性，使其在超高速電子學和大功率脈沖產生與整形技術領域（大功率亞納秒脈沖源、超寬帶射頻發生器等）具有廣泛應用前景。 -
Bluetooth operates in the global available 2. 4ghz free ism band, its topology is the piconet. it implements the wireless communication with data and voice, by the combination of circuit switching and packet switching
藍牙使用免申請2 . 4ghzism頻段，採用微微網作為其網路的基本單元，並採用電路交換技術和分組交換技術組合，實現語音和數據的無線通信。 -
Abstract : combining the tenth five _ year plan of tianjin telecommunication, the paper states some problems relating to the planning of the local telephone switching network in the new period, such as the situation that was faced for the telecommunication networks, the major questions that were needed to solve in planning, the problems of continued development in telephone services and the transit of n _ band network to b _ band network
文摘:結合天津電信「十五」規劃的編制，闡述了在新時期本地電話交換網規劃中所涉及的幾個問題，如電信網面臨的形勢和規劃中需要解決的重大課題、電話業務持續發展的問題及由窄帶網向寬帶網過渡的問題等等。 -
The chip can be widely used in mp3 player, pda, digital camera, cells phone and portable products etc. this thesis first introduces the basic theory of switching power supply. the operating theory of this circuit has been demonstrated. the operating principle and simulation analysis about band gap reference, self - biased current source, one shot circuit, hysteresis comparator, and current - limit circuit have been particularly expounded in this thesis
本文首先闡述了開關電源的工作原理，詳細介紹了本電路的整體工作原理，最後重點介紹了自偏置電流源電路、基準源電路、單穩態觸發器電路、峰值電流限制及低電池電壓遲滯比較器的工作原理，並利用eda工具larker ? ams 、 hspice對電路進行了完整的設計和模擬模擬，給出了合理的電路數據，各子模塊電路的電特性參數均達到或優于設計所需指標。 -
Along with the technology mature in the soft switching and media gateway, the narrow band access equipment will be integrated the function of media gateway. users may access directly to the broadband ip man through twisted cabling or wireless base station. dial - up server will also be replaced by the media gateway, narrow band dial - up users will be diverted to broadband ip man at the access network
隨著軟交換和媒體網關技術的成熟，在窄帶接入層設備上將綜合媒體網關的功能，用戶通過雙絞線或無線基站接入后，可以通過媒體網關直接接入寬帶ip城域網，撥號服務器也將大量被媒體網關取代，窄帶用戶撥號上網將在接入網被分流至寬帶ip城域網。 -
The thesis also describes the design of the switch hardware, including microprocessor subsystem module, layer 2 / layer 3 switching module, fe interface module, ge interface module and out - band management module. the interface circuits among modules are introduced as well. finally, the thesis estimates the overall structure of the software. the implementation methods described in the thesis are also valuable references for the design of other switches based on other switching chips
接著文章詳細介紹了該款交換機的硬體設計，給出了包括微處理器子系統模塊、 l2 l3交換模塊、 fe介面模塊、千兆介面模塊以及帶外管理模塊在內的主要模塊的電路設計實現，對各模塊之間的介面電路也作了介紹，文章最後對軟體的總體結構進行了分析。 -
The essential requirements for the frequency synthesizer are : 1 ). low side band power 2 ). high hopping speed 3 ). short convergence time direct digital synthesis technology has the advantages of low cost, low power consumption, high frequency discrimination and short switching time
直接數字合成技術dds具有低成本、低功耗、高解析度和快速轉換時間等優點，是實現快速跳頻的一個關鍵技術。本文討論了如何實現高速的跳頻系統。 -
Bluetooth wireless technology uses the globally available unlicensed ism radio band of 2. 4ghz and its topology is best described as a multiple piconet structure. it implements the wireless communication with data and voice, by the combination of circuit switching and packet switching
藍牙使用免申請2 . 4ghzism頻段，採用微微網作為其網路的基本單元，並採用電路交換技術和分組交換技術組合，實現語音和數據的無線通信。 -
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
直接數字頻率合成器是一種全數字化的頻率合成器，由相位累加器、波形rom 、 d a轉換器和低通濾波器構成， dds技術具有頻率解析度高、頻率切換速度快、頻率切換時相位連續、輸出相位噪聲低和可以產生任意波形等優點。 -
The states of the closed loop system moved in the sliding mode band of the time - varying sliding surface globally. reaching mode is eliminated and robustness of the closed - loop system is enhanced. the sign function of the switching surface function is replaced by a saturate function to reduce the chattering
該控制方法使得閉環系統對于任意初始狀態都處于滑動模態區內，然後通過結合旋轉和平移滑模面的方法，使隨後任何時刻的系統狀態都處于滑動模態區內。 -
In the simulation system, the performances have been analyzed when the parameter of torque hysterelic comparator or the hysteretic band of stator flux is changed. the simulat ion of switching between hexagon flux control and circle flux control is also compl eted. in addition, the traditional pi regulator is improved in the paper
在模擬中分析了轉矩滯環和磁鏈滯環參數的變化對系統控制性能的影響，並且對兩種控制方法在基速范圍內的切換進行了模擬研究，同時在模擬中採用積分分離式pi調節演算法對傳統的pi調節器進行了改進。 -
Atlantic switching power supply with world - class certification, and the overall voltage input and the input band fuse protection, automatic overload protection and restoration of two different type of style
Idec切換式電源供應器具備世界級認證通用電壓輸入帶熔絲保護的輸入自動恢復型過載保護以及兩種不同的設計風格。 -
Then, detail discusses were given on. finally, on the basis of above analysis and research, by comparing various design methods, a l band agile frequency synthesizer with 256mhz bandwidth and 1mhz resolution was designed, whose switching time was within 4 us. however, the spur performance is to be improved
最後，在對各種捷變頻技術綜合分析和研究的基礎上，經過反復的方案比較論證，設計了一個l波段256mhz帶寬，步進為1mhz的捷變頻頻率合成器，捷變時間在4 s以內，不過雜散指標還有待進一步改進。
分享友人