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ADF4159 FMCW incorrect frequency sweep!!!?

Question asked by Newpp on Mar 20, 2017
Latest reply on Mar 23, 2017 by Newpp

Hi All,

 

Can anyone help me with this issue? I am using ADF4159 evaluation board.

I set a FMCW in continuous sawtooth mode, RFout 12GHz (VCO frequency), 3 steps in the waverform (the frequency jumps 2 times from 12GHz), each step 1MHz, total ramp 2Mhz. It is very simple waveform. I just want to test the ADF4159.

 

Photo1 is my register values.

Photo2 is the center frequency at 12.00012GHz.

Photo3 is the first jump at 12.00220GHz (step about 2Mhz)

Photo4 is the second jump at 12.00420GHz(step about another 2Mhz)

The total ramp is about 4Mhz.

HOWEVER, the photo1 shows the per step is 1MHz, total ramp is 2MHz.

These two don't match each other. What is the issue???

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