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[FAQ] RF synthesizers: Can I modulate the internal VCO of a RF synthesizer?

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I want to do FM modulation with the internal VCO, is this possible? Can you tell me how to feed the modulation signal to the VCO?
  • Theoretical speaking, modulation is possible but it is not straight forward as there are several VCOs inside the chip and the Kvco does not host a linear relationship with frequency.
    If we were to doing this, I suggest use active loop filter so that we can feed the modulation signal to the "+ve" pin of the amplifier.
    Please note, we have never characterized this application, we are not able to provide further support on this. 

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