The Designer's Guide Community Forum https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> Transient Noise in Spectre https://designers-guide.org/forum/YaBB.pl?num=1174532664 Message started by badminton on Mar 21st, 2007, 8:04pm

Title: Transient Noise in Spectre Post by badminton on Mar 21st, 2007, 8:04pm Hello all,   I am designing a low-jitter clock buffer.  For jitter simulation I plan to use the transient noise simulation feature in spectre.  However, I am not very sure how to set the various settings (noiseseed, noisefmax, noisescale, etc.) to obtain a sufficiently accurate simulation of jitter, while minimizing simulation time.  Can anyone give me some pointers?  Thanks! Sincerely, Badminton

Title: Re: Transient Noise in Spectre Post by Michiel on Mar 22nd, 2007, 4:09pm badminton wrote on Mar 21st, 2007, 8:04pm: Hello all,   I am designing a low-jitter clock buffer.  For jitter simulation I plan to use the transient noise simulation feature in spectre.  However, I am not very sure how to set the various settings (noiseseed, noisefmax, noisescale, etc.) to obtain a sufficiently accurate simulation of jitter, while minimizing simulation time.  Can anyone give me some pointers?  Thanks! Sincerely, Badminton I would advise to gain some familiarity with the simulation first. You can start with a simple circuit like an inverter. -the value of noiseseed is of little importance. Just set it to one. -set noisefmax to a frequency that is significantly higher than the bandwidth of interest. For a first test you could use 10G -if you trust your model parameters, set noisescale to one

Title: Re: Transient Noise in Spectre Post by badminton on Apr 24th, 2007, 10:54pm Thanks for the tips. I have some other questions about transient noise simulations: 1.  How do the transient noise waveforms compare with the waveforms measured on an actual circuit?  In other words, how much can we trust transient noise simulations? 2.  How exactly is spectre simulating transient noise?

Title: Re: Transient Noise in Spectre Post by Geoffrey_Coram on Apr 25th, 2007, 3:40am badminton wrote on Apr 24th, 2007, 10:54pm: 2.  How exactly is spectre simulating transient noise? I think there's a whitepaper on this on SourceLink.

Title: Re: Transient Noise in Spectre Post by venki_vlsi on May 16th, 2007, 9:30pm hi, Can u plz send link of that paper. where is source link?i dint get it. plz help me.

Title: Re: Transient Noise in Spectre Post by Geoffrey_Coram on May 17th, 2007, 4:10am http://sourcelink.cadence.com You need to register (meaning, I think, you need to be a Cadence customer.)

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