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電壓控制振蕩電路設計與仿真外文翻譯-其他專業(yè)-資料下載頁

2025-01-19 03:21本頁面

【導讀】鐘和電子手表中采用頻率穩(wěn)定度很高的振蕩電路作為定時部件等。在通信系統(tǒng)電路中,乎與電流源電路和運放電路具有同等重要的地位。壓控振蕩器的類型有LC壓控振蕩器、RC壓控振蕩器和晶體壓控振蕩器。與控制電壓成線性關系并宜于集成等。窄;RC壓控振蕩器的頻率穩(wěn)定度低而調(diào)頻范圍寬,LC壓控振蕩器居二者之間。中,本設計中采用變?nèi)荻O管作為壓控可變點抗元件,這樣就可形成LC壓控振蕩器。的壓控可變電抗元件是電抗管,后來大都使用了變?nèi)荻O管。在微波頻段,用反射極電壓控。換電路、移動式手持設備等提供了很好的解決方案。調(diào)集電路在高頻輸出方面比其他兩種電路穩(wěn)定,幅度較大諧波成分比較。振蕩器輸出信號中的高次諧波成分較大,信號波形較差。采用壓控振蕩器芯片MC1648和變?nèi)荻O管MV209,外接一個LC振蕩回路構成變?nèi)荻O管壓控振蕩器。為了擴大調(diào)頻范圍,石英晶體可用AT切割和取用其基頻率的。間的矛盾也有待于解決。

  

【正文】 4: integrated circuit oscillator. Using voltagecontrolled oscillator chip MC1648 and varactor MV209, external a LC oscillation circuit of varactor vco. Only need to adjust the voltage at the ends of the varactor diode, can change the output frequency MC1648. The adoption of integrated chip, simple circuit design, high system reliability, and phaselocked loop frequency synthesis technique can be used to make the output frequency stability is further improved. the RC voltagecontrolled oscillator RC voltagecontrolled oscillator39。s frequency stability is low and wide range of frequency modulation, the RC voltagecontrolled oscillator in the monolithic integrated circuit is monly used in RC voltage controlled multivibrator voltage controlled crystal oscillator In a quartz crystal oscillator frequency stabilization, the varactor diode and concatenated quartz crystal phase, can form a voltage controlled crystal oscillator. In order to expand the range of frequency modulation, available AT cut quartz crystal and access the base frequency of quartz crystal, the circuit can also by broadening the scope of the FM transformation work. At microwave frequencies, with reflector voltage control reflex klystron oscillator frequency with the anode voltage control frequency magron oscillator and so on also belong to the nature of the voltagecontrolled oscillator. Voltagecontrolled oscillator application range is very wide. Integration is an important development direction. Quartz crystal voltagecontrolled oscillator frequency stability and frequency modulation in the contradiction between range and needs to be solved. Along with the development of the deep space munication, will need internal noise level very low voltage controlled oscillator.
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