The FM modulation circuit of crystal oscillator

  
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In the figure is the FM modulation circuit of crystal oscillator. FM modulation has direct and indirect FM ways, the direct FM method is to directly change the frequency of the oscillating circuit, it`s simple, but as it is the LC oscillating circuit, the bias is kind of noticeable, and the stability is weak, i.e the frequency is easy to be affected by the..
The FM modulation circuit of crystal oscillator - schematic




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