The relation of VCO gain and the noise of VCO tuning voltage

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hrkhari

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vco gain

I would appreciate if you guys could comment on the statement below in detail. Thanks in advance

Statement:
A high VCO gain results in high sensitivity to the noise of VCO tuning voltage, which increases the spur level and degrades the phase noise.

Rgds
 

Re: VCO Gain

VCO gain is stated in MHz/volt. So if the VCO changes 10 MHz for 2 volt change on the tuning line, the gain is 5MHz/V. The higher this gain, the more sensitive the tuning line is to any interference. Interference on the tuning line translates to unwanted FM on the VCO output.
 

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