ayounis
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Posts: 6
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Thanks Sheldon, When I run the setup for 10us using spectre, I get what I expect. When I change the simulation time *only* from 10us to 100us and rerun, I get a totally different behavior of the control voltage. All blocks are working; vco is oscillating with the correct frequency, pfd is working as expected, but the in the first 10us of the simulation, I don't see the same behavior of the control voltage. i.e., the control voltage will look different when you set the stop to 10us and let the simulation finish, and when you set stop to 100us and then stop the simulation after 10us. Am I making sense here?
Ahmed
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