how i can get coherent output for adf4159?

how i can get coherent output for adf4159?

If you are using the ramping/sweeping/FMCW generation in the ADF4159, then the VCO output phase will not be coherent. The output phase can settle to any of 360°/MOD for each step of the ramp.

The ADF4159 is used in this way in many FMCW applications. Are you sure the phase need to be coherent?

MOD = 2^25 = 33554432.

What is your output frequency range? Many of our PLLs can be phase coherent outputs but they cannot sweep as fast as the ADF4159. For example, the phase resync feature on the ADF4351 allows for phase coherent: www.analog.com/adf4351

If you are using the ramping/sweeping/FMCW generation in the ADF4159, then the VCO output phase will not be coherent. The output phase can settle to any of 360°/MOD for each step of the ramp.

The ADF4159 is used in this way in many FMCW applications. Are you sure the phase need to be coherent?

MOD = 2^25 = 33554432.