Dear laoudi, In response to your additional questions ... > I still have some questions. I have read the article > in this link: what are the limitations? Did you happen to catch the following statement "Spectre does linear interpolation between noise data points. In transient noise analysis, all noise sources are band limited by noisefmax." at URL: support.cadence.com/.../ArticleAttachmentPortal > #1 I agree this method is straightforward. It is also the most accurate. > #2 ...Is there a theoretical formula to determine how this > noise affects phase noise/jitter of osc? Yes. The phase noise due to supply noise is directly related to the output phase noise by its Kvreg where Kvreg expresses how the oscillator output frequency varies with supply voltage. I have attached a Microsoft Excel workbook I created a number of years back that provides a plot of the contribution of an oscillator's supply noise to the oscillator output phase noise for your inspection. You may find it of use. You may enter up to two sets of data of voltage supply noise versus frequency data, some information on your oscillator frequency and its Kvreg and it will produce a plot of the contribution of each voltage noise characteristic on the osciillator phase noise. > #3 Is there any manual to see how to simulate jitter from a transient noise sim? There is a relatively new ViVA calculator function to estimate phase noise from a transient noise simulation. Some details are provided in the following Cadence support documents at URL: support.cadence.com/.../ArticleAttachmentPortal support.cadence.com/.../ArticleAttachmentPortal and the RAK at URL: support.cadence.com/.../ArticleAttachmentPortal I hope this provides some answers to your questions. Shawn community.cadence.com/.../vco_5F00_pnoise_5F00_vreg_5F00_ss_5F00_template_5F00_sml_5F00_111615.xlsx
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