I am using the ADF4158 to design a wide band VCO(400 to 500MHz), it looks the model parameters is not correct at those bandwidth in ADIsimPLL software for this IC according to our testing. Actually, I had made a PLL and VCO using this IC through manually tuning the Loop Filter and CP setting resistor, and found the ADF4158 has best phase noise, but the simulating at 450MHz gives incorrect results, I think.
The attached pictures show the phase noise and the loop filter parameters.
So, If anybody knows how to handle this simulation at 450MHz? Thank you a lot.