The FM modulation circuit of crystal oscillator

Published:2011/6/20 1:33:00 Author:Seven | Keyword: FM modulation, crystal oscillator | From:SeekIC

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 power supply voltage change and the temperature change. By using the crystal oscillating circuit, the frequency stability is high and the bias is only about 1%. In the circuit, X is a 10MHz crystal oscillator and it directly modulates the frequency of the circuit.



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