HMC586

Question

Dear Sir 
 How to test the phase noise of VCO. VTune access + 5V DC power supply？ 
 For example HMC586 
 Thanks

kieranb · Accepted Answer

Hi, 
 Yes, to test the phase noise, you just need to apply a 5v with an adequate current limit. Then apply a Vtune between 0v and 18v to the Vtune terminal an connect the RFOUT to a suitable phase noise analyzer. 
 Note that this is open loop phase noise and the closed loop phase noise will be different in-band based on the loop filter, reference frequency etc. 
 Regards, 
 Kieran

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