Talk about the result of my Frequency Synthesizer

Hi,
I am working in a Δ-Σ Fractional-N Frequency Synthesizers, and I want to get some advice about the result of it.
This Δ-Σ Fractional-N Frequency Synthesizers is design for blue-tooth, and I run a 50us tran simulation with reltol 1e-4,vabstol 1e-6, iabstol 1e-12 and conservative setting, the output frequency is set to be 2.450GHz, and here is my result:

output frequency vs time


zoom in figure of the output frequency, and the output dither is about 300k(can this be reduced if I imcrease the tolerances?)


the dft result of the VCO output signal


How about my result, please? And are there any other simulation should I do to analyse it, please?

What should I do next, please? Please give me some advice.

Thank you.
Best regards!

The reference frequency is 32MHz, and the cp current is 400uA. The output freqency is 2.450G.
I am worry about the reference spur, how can I get this spur value, please?

Thank you.
Best regards!

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