I have my own ad9957 board (schematic is attached).
AD9957 is programmed in single tone mode.
Charge Pump Current 312uA.
VCO Band - 3.
Frequency Multiplication factor - 26
System Clock Frequency 650 MHz
I have the problem with the dirty spectrum near my signal.
Pll filter was designed with PLL_Loop_Filter Tool.
1) Open Loop Bandwidth - 100KHz
2) Open Loop Bandwidth - 1.2 MHz (Narrow-Band View)
Please tell me, where there may be a problem ?