Hello:
I want to use a Verilog-A model  to run a phase noise simulation by Spectre-RF or ADS.But it always show some error messages.

I just want to use verilog-A model to substitute some blocks in the PLL .

How to use those model appropriately ?Is there another methods to run phase noise simulation?
~Thanks~

I use the verilog-A model to substitute PFD,CP and the divider block in the PLL to run a phase noise simulation by Spectre-RF.
I follow the same steps (period steady state simulation-->phase noise simulation) as usual.
For a ideal verilog-A model,there is no noise exists,and it can not find steady state solution.So,I can not run phase noise simulation if I just use a ideal verilog-A model.
What method  should I use to do the phase noise simulation if I want to run a block that described by verilog-A model?
~thanks~