Our board output of ADF4355-3 has spurious at 1. 8kHz. The spurious is constant in different output frequency, bleed current and CP current.
We attempt to replace DC-DC with external power supply，but the spurious still unchanded.
We have a few questions:
1. Why and how to eliminate the spurious.
2. Why and how to Increase output power.
The specific register configuration and spurious is shown in the figure below