電壓控制振蕩電路設計與仿真外文翻譯-展示頁
2025-01-22 14:17本頁面
【正文】 ery circuit and frequency synthesis apparatus such as circuit is Paramount, it is no exaggeration to say in the field of electronic munications technology, VCO voltage controlled oscillator and opamp circuit with current source circuit almost equally important position.Voltagecontrolled oscillator (VCO) type of LC VCO, RC voltagecontrolled voltage controlled oscillator and crystal oscillator. Technical requirements of the voltagecontrolled oscillator are: good frequency stability, control of high sensitivity, wide range of frequency modulation, voltage deviation and control into linear relations conducive to integration, etc. Voltage controlled crystal oscillator frequency stability is high, but the frequency range is narrow。Abstract: oscillator is widely applied in all walks of life, such as in radio measuring instruments, it produces a variety of frequencies of sine signal voltage: during hot working, heat treatment, ultrasonic processing, and some medical devices, it produces high frequency electric energy of power on heating load。石英晶體壓控振蕩器中頻率穩(wěn)定度和調頻范圍之間的矛盾也有待于解決。壓控振蕩器的應用范圍很廣。為了擴大調頻范圍，石英晶體可用AT切割和取用其基頻率的石英晶體，在電路上還可采用展寬調頻范圍的變換網(wǎng)絡。由于采用了集成芯片，電路設計簡單，系統(tǒng)可靠性高，并且利用鎖相環(huán)頻率合成技術可以使輸出頻率穩(wěn)定度進一步提高。采用壓控振蕩器芯片MC1648和變容二極管MV209，外接一個LC振蕩回路構成變容二極管壓控振蕩器。反饋信號取自電容兩端，由于電容對高次諧波呈現(xiàn)較小的容抗，因而反饋信號中高次諧波分量小，故振蕩輸出波形好，而且電容三點式振蕩器的頻率穩(wěn)定，適于較高工作頻率。三：采用電容三點式振蕩器。由于兩個電感之間有互感存在，所以很容易起振。一般應用于中、短波波段?；ジ旭詈险袷幤髟谡{整反饋（改變耦合系數(shù)）時，基本上不影響振蕩頻率。調發(fā)電路只能解決起始振蕩條件和振蕩頻率的問題，不能決定振幅的大小。常用的LC振蕩器有以下幾種：一：采用互感耦合振蕩器形式。在通信技術、測量技術、計算機技術等各種領域中，常常要用到精度比較高，頻率穩(wěn)定度高且方便可調的信號源，電壓控制振蕩器是如今使用非常廣泛的一類電子器件，為電—光轉換電路、移動式手持設備等提供了很好的解決方案。早期的壓控可變電抗元件是電抗管，后來大都使用了變容二極管。晶體壓控振蕩器的頻率穩(wěn)定度高，但調頻范圍窄；RC壓控振蕩器的頻率穩(wěn)定度低而調頻范圍寬，LC壓控振蕩器居二者之間。壓控振蕩器（VCO）的類型有LC壓控振蕩器、RC壓控振蕩器和晶體壓控振蕩器。畢業(yè)設計（論文）外文翻譯
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