modulation amplifier 中文意思是什麼

modulation amplifier 解釋
調制信號放大器
  • modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
  • amplifier : n. 1. 【電學】擴大器；擴音器。2. 放大鏡；放大器。
  1. This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering. at first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu - lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band - pass filter, alternating amplifier, phase sensitive demodulatorn, pulse - width modulation, frequency scale circuit, moment current generator. finally, using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system, realized the testing functions

    首先對加速度計及其測試技術的發展歷史和現狀，液浮擺式加速度計的工作原理和數學模型等作了簡要的介紹，然後確定了以二元調寬脈沖再平衡測試迴路為設計方案，並從控制理論的角度進行了分析，著重研究了系統中各部分的傳遞函數，利用系統開環傳遞函數分析了系統的穩定性，同時設計了系統的校正網路;分析了二元調寬脈沖再平衡測試迴路的解析度、采樣約束以及測試精度等基本問題，並按照系統分析的結果設計了包括前置放大、帶通濾波、交流放大、相敏解調、脈寬調制、頻標電路以及力矩電流發生器等測試系統各部分硬體電路，驗證了電路的正確性，最後按照測試系統的要求，採用了美國ni公司專為測試領域所開發的虛擬儀器工具? ? labview作為測試軟體開發工具，利用該圖形化編程語言完成了測試系統軟體部分的設計，實現了測試功能。
  2. But up to now, none of them are commercially available. among these technologies, wavelength converters based on cross - gain modulation, cross - phase modulation and four - wave mixing in semiconductor optical amplifier is the mainstream of research

    其中，基於半導體光放大器中的交叉增益調制、交叉相位調制和四波混頻效應的波長轉換技術是研究的主流方向。
  3. According as the analysis of third - order inter - modulation of high - power amplifiers, an innovative practical method to adjust the feed - forward amplifier system to optimize the performance of feed - forward amplifier system is described. the application of feed - forward linearisation to a 890 - 915mhz amplifier is described

    詳細分析了高功率放大器的三階互調產物的特點，並據此創新的提出了調整前饋線性化系統狀態，優化前饋放大器性能的正確方法。
  4. The main part and key technique of the cpa system is study : the generation of the femtosecond laser pulse is study, the modulation and maintenance of the ti : s laser is learned ; the types of the measurement for ultrashort laser pulse is generalized and the interferometric autocorrelation is expatiated ; the varieties of the stretchers is sum up and aberration - free stretcher is calculated and optimized to improve the stretching ratio ; the pulse selection is analyzed and a single pulse can be selected successful from the pulse train at a repetition rate of 82mhz ; the kinds of the amplifier in cpa system is gathered up, the eight - pass pre - amplifier and a good many effects in it is investigated. finally, the second, third and fourth - order dispersions in cpa system is analyzed systemicly, and the according means for dispersion compensation is worked out

    對cpa系統的主要環節及關鍵技術進行了研究：掌握了鈦寶石激光器的調節和維護技術，較深入地研究了飛秒激光脈沖產生的機理，其中對群速色散、自相位調制、自鎖模等問題進行了詳盡的分析；總結了超短激光脈沖的測量技術，重點研究了干涉自相關測量法；在總結展寬器類型的基礎上，對無象差展寬器進行了理論計算、優化設計，提高了展寬倍數；深入論述了脈沖列的選單問題，熟練掌握了脈沖選單技術。
  5. For implement of wide band modulation, multi - carries and elimination of adjacent channel interference to satisfy ber requirement in wcdma system, which is most popular in 3g technology, the linearity requirement of the base station power amplifier becomes tighter

    以wcdma為代表的第三代移動通信技術，為實現寬帶調制、多載波應用，同時減小鄰通道干擾以滿足通信系統的誤碼率要求，對基站發射機功放的線性指標要求苛刻。
  6. The results show that wavelength locates in gain zone of semiconductor optical amplifier, and have higher peak power and proper time delay between the two pulses for the second order super gauss control pulse in semiconductor optical amplifier. a high quality amplified signal pulse can be achieved. the chirp can be reduced notability by using cascading soa in cross gain modulation based on soa, and the distance and the peak power of conversion optical pulse can be increased notability, and we can let down the demand for wavelength based on xgm in soa and enhance the flexibility of wavelength conversion

    我們應用二階超高斯光脈沖與高斯信號脈沖同時注入soa和應用soa與非線性光學環鏡（ nolm ）相結合的方案來對信號脈沖進行壓縮整形，模擬顯示，在調節系統合適參數的情況下，波長位於soa增益區的二階超高斯控制光脈沖在具有較高的峰值功率和適當時延下輸入soa時，最後可以得到放大的高質量超簡訊號光脈沖；在基於soa的交叉增益調制（ xgm ）全光波長轉換中，採用級聯的soa能有效地使反轉光脈沖的頻率啁啾得到有效降低，波長向下轉換的距離和反轉光的峰值能量都得到明顯提高，降低了利用交叉增益調制（ xgm ）波長轉換中對波長精度的要求，從而提高了波長轉換的靈和性。
  7. The matlab simulation result shows that if the bit error rate has the order of 10 - 4, and 16 - qam constellation modulation is applied, this technology is capable of reducing amplifier optimized output back - off by 7db

    Matlab模擬結果表明在誤比特率為10 ? 4時，採用16 - qam的星座調制方式，該技術能將放大器的最優回退減小7db 。
  8. The bluetooth chip nrf2401 uses the gfsk modulation. after analyzing and comparing the characteristic of every class power amplifiers, the thesis bring up with the idea of using a switched mode power amplifier to achieve the demanding output power and the higher efficiency

    結合「微型核」信息電子系統實現方案中nrf2401藍牙晶元的特點，本文通過對各類功率放大器的結構和特點的分析比較，提出了採用了開關類功率放大器來實現系統輸出功率要求和盡可能高的效率的設計思想。
  9. Measurements of the electrical properties of transmitting tubes - measuring methods of dual tone inter - modulation distortion of linear amplifier tubes

    發射管電性能測試方法線性放大管雙音互調失真的測試方法
  10. The paper analyzes in detail the mechanics and optics theory. in the light of the characteristic of the intensity modulation optical fiber sensor, the reference - way is presented to compensate the error signals which are caused by the bias light, dark current of photoelectric detector, temperature drift of pre - amplifier

    文中詳細分析了這種傳感器的力學和光學工作原理，並且針對所選用的強度調制型光纖傳感器的工作特點，提出採用參考通道補償由於背景光、光電探測器的暗電流、前置放大器溫漂等因素引起的誤差。
  11. At first the switching power amplifiers of the discrete components are researched and some application circuits for amb power amplifiers are developed. secondly the integrated power amplifier is discussed, a new type of pulse width modulation ( pwm ) power amplifier applying sa60 is designed and used in amb system. in the end of the dissertation several synthesized tuning measures and some experimental results for amb system are presented

    首先討論了分立元件開關功率放大器原理並研製了在電磁軸承中的應用電路；其次討論了集成功率放大器，應用sa60設計了新型脈寬調制功率放大器並在電磁軸承中應用；在論文的最後給出了電磁軸承系統綜合調試的一般方法及調試結果。
  12. In this dissertation, a boa - type waveguide optic switch with double - heterostructure gaas / gaalas has been researched. gaas - based integrated optical devices have good temperature, good anti - radiation and optical - transmission characteristics, and also have wide transparent range of wavelength. they can also be integrated on a chip with optical active devices and electronic devices, such as semiconductor laser, optical modulation, optical amplifier, pin, and so on

    基於gaas材料的集成光學器件不僅具有良好的光傳輸特性、溫度特性、抗輻射能力和其較寬的透明波長范圍，還有望進一步實現晶元與光源、光調制器、光探測器和半導體光放大器等其它光電器件以及集成電路的單片集成；採用gaas gaalas雙異質結材料製作的光開關可以得到較低的開關電壓，而且採用gaas gaalas異質結材料的光傳輸損耗很小。
  13. Based the research on the laser beam drift feedback control technique, analysing the beam drift and its frequency components, a laser beam directional stability method is studied in the thesis in detail, with its measurement and control circuit system that combines the laser beam intensity modulation and the beam drift feedback control technique. in this method, at first the laser beam intensity is modulated with the acoustooptic modulator, then the lock - in amplifier is applied to detect and demodulate the modulating signal, at last a feedback control signal is generated by the dsp control circuit at last, including : 1

    本文在原有的激光光束漂移量反饋控制準直技術的基礎上，對光束漂移量信號的數據和頻譜進行了分析，重點研究了一種集聲光調制光強與光束漂移量反饋控制準直技術於一體的激光光束方向穩定方法及其測控電路系統，該方法通過聲光調制實現光強調制，接著通過鎖相放大電路檢測並解調調制信號，然後通過dsp控制電路進一步對光束的漂移量進行反饋控制。
  14. Results are given for a series of two - tones inter - modulation distortion measurements and the im3 is 48dbc. it is shown that a 24db improvement in the inter - modulation margin can be achieved when the amplifier ’ s output is 49dbm. and the efficiency of the whole system is 27. 8 %

    經雙音測試證明，本系統在輸出總功率為49dbm時，三階互調產物抑制比為48dbc ，較未加入線性化系統前改善了24dbc ，此時系統總效率為27 . 8 % 。
  15. At last, a comparison of advantages and disadvantages of various modulate techiniques used in the switching power amplifier at present. then, pulse width modulation ( pwm ) switching power amplifier is designed and debugged

    最後闡述了功率放大器的工作原理和特性，在分析了目前開關功率放大器所採用的調制技術、比較了各種調制技術優缺點的基礎上，設計了脈寬調制開關功率放大器的電路，並進行了調試。
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