axuan
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When I using phase domain model verilog-a model in "PLLnoise+jitter.pdf" to analysis pll's phase noise, I encountered some questions, 1) How can i use "ground" correctly, when i use it in loopFilter's model , compiling occurs error of "ground is a future reserved keyword, ..." 2) When i delete ground and connect node 'gnd' to ground symbol at top level, compiling passed with warning, I can perform a PSS to analysis pll phase model(like Listing1 and with blocks' models ). but analysis stopped at 97.5% and show that V(out) is too small to reliably detect the period of the oscillator....Why does it occur and how to perform a correct PSS analysis?(I set "beat freq" equa to V(in)*Kvco) 3) Why SpectreRF reguard 'out' as a voltage signal?How to analysis phase signal in PSS analysis? 4) Theta(out) in vco model will get larger and larger with time increase, is this a problem? Can anyone help me? ???
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