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ADF4351 Diffrential Mode to I,Q Mod

Question asked by amir1964 Employee on Aug 22, 2012
Latest reply on Aug 22, 2012 by icollins

Hi There, 

I just got EVB of ADF 4351.

The application is ADF4351 driving ADL5385 Differential mode .

I changed the EVB for wide band operation: L2,L3=50R. L4,L1 = 0R.

I measured the Harmonics of each output A-/A+.

The unused output loaded with 50ohm termination while the measured output connected
directly to the spectrum analyzer (no cable).

 

The result is surprising:the harmonics not equal >up to 6 db different in 2nd harmonic.

The questions are:

  1. Is the results meet the spec ?
  2. how can rely on even harmonics cancelation in differential mode ?

 

BR

 

Amir

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