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:
- Is the results meet the spec ?
- how can rely on even harmonics cancelation in differential mode ?