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Rx VCO Leakage Effects on transmitter Performances

Question asked by 3yang on Aug 16, 2016
Latest reply on Aug 26, 2016 by sripad

I found a problem similary with" Tx VCO Leakage Effects on Receiver Performances ".

When I configure ad9361 works as FDD,Tx Freq = 2400.000MHz.

If Rx Freq = 1200.250MHz or Rx Freq = 2400.250MHz or Rx Freq = 4800.250MHz , there will be many spurs in the transmitting spectrum.

After investigation,I found that the spurs will be smaller  if the difference between Tx vco frequency and  Rx vco frequency greater than pll filter bandwidth and will disappear if the difference between Tx vco frequency and  Rx vco frequency greater than 1MHz.

What are your recommendations to minimize the spurs.

thank you


 

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