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The "overshoot" phenomenon and doubts of ADF4158 sawtooth wave modulation , need help!

Question asked by daifancer on Aug 17, 2017
Latest reply on Nov 3, 2017 by daifancer

Hello everyone, I have recently used the ADF4158 sawtooth wave linear FM function,
in the actual test,when measureing the VCO tuning side by oscilloscope,
found that the starting point of the sawtooth waveform has an "overshoot" ,
as shown below:

Regardless of the frequency of the sawtooth wave, the "overshoot" always exists, and I have tried to increase the bandwidth of the loop filter, which seems to be ineffective.
What is the reason for this phenomenon? How can I solve this problem?
Hope to get some advice, thank you!