LC-VCO control voltage

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hanikapa

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Hello,
does anybody know that why a resistance is made in series with the control coltage of LC oscillator and in which range should be this resistance?
Thanks
 

Hello,
does anybody know that why a resistance is made in series with the control coltage of LC oscillator and in which range should be this resistance?
Thanks
In order to isolate RF signal from Control Voltage supply.It may practically be around 10K-22K
 
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