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Page 1 of 1 (10 items)

Re: RE: Phase noise simulation in ring oscillator
Hello Smlogan and Andrew, Thank you very much for your replies and hints. I will try again with the new settings and will report the results. However in general it seems to me very strange that the results are so much better when I select only one of the two outputs of the differential ring oscillator as the ouptut node in the pnoise ...

Posted to RF Design (Forum) by Ayrin on Wed, Feb 27 2013
Re: RE: Phase noise simulation in ring oscillator
Hello Tawna, Thanks for your support. Here is the option section of my setup: analysis('pss ?fund "1.5e9" ?harms "20" ?errpreset "conservative" ?oscana t ?p "/xp<1>" ?n "/gnd!" ?ppv "" ) analysis('pnoise ...

Posted to RF Design (Forum) by Ayrin on Thu, Jan 17 2013
Re: Phase noise simulation in ring oscillator
Hi, Thanks for your reply! The version of the tool I am using is: IC6.1.5 and for MMSIM it is 7.2. I set no special option: PSS (shoting method) pluse PNOISE. The oscillator is a ring oscillator with CMOS inverter type of delay elements. To make it differential, there is a weak cross-coupled between each two differential ...

Posted to RF Design (Forum) by Ayrin on Wed, Jan 16 2013
Re: Phase noise simulation in ring oscillator
Hi, Coming back to the issue of phase noise simulation for a ring oscillator, I have seen again the two following issues: (1) for a differential ring oscillator, the simulated phase noise at 1 MHz offset is just very high (about 0 dBC/sq.Hz). I don't think this is correct. Here I introduce /voutp and /voutn as the outputs of the ...

Posted to RF Design (Forum) by Ayrin on Tue, Jan 15 2013
Re: Phase noise simulation in ring oscillator
Hi Andrew, The version of the Cadence tool is IC6.1.5 and for MMSIM it is 7.2I didn't try "Lorentzian", even I couldn't find it in the options of pnoise analysis Thanks, Armin

Posted to RF Design (Forum) by Ayrin on Thu, Jul 5 2012
Phase noise simulation in ring oscillator
I have two questions regarding the phase noise simulation results (PSS + Pnoise) for ring oscillators: (1) How much the precision of the initial oscillation frequency is important in estimating phase noise ? (2) The results that I get for the phase noise seems a bit high. I feel there is a shift up in all the frequencies. In very low frequencies ...

Posted to RF Design (Forum) by Ayrin on Wed, Jul 4 2012
Re: ocean run corner on the termination of an error is encountered!!!!
Now everything is quite clear ! Thank you very much for your help. Armin

Posted to Custom IC SKILL (Forum) by Ayrin on Tue, Jul 3 2012
Re: ocean run corner on the termination of an error is encountered!!!!
Thanks for your reply. From your explanation, what I can understanding is that since some of the outputs of my measurements are "nil", so the loop stops, right? Otherwise, if I use the construction that you introduced, then the loop continues even if tran simulation stops due to convergence. I am ...

Posted to Custom IC SKILL (Forum) by Ayrin on Tue, Jul 3 2012
Re: ocean run corner on the termination of an error is encountered!!!!
Dear Andrew, To simplify, my script is something like this: foreach(myVDD '(1.0 1.1 1.2) foreach(myTEMO '(-40 37 90) foreach(myMOS '("tt" "ss" "ff") analysis('tran ?stop 10u) run() fprintf() ))) It starts runing and just in one of the corners the simulator stops ...

Posted to Custom IC SKILL (Forum) by Ayrin on Tue, Jul 3 2012
Re: ocean run corner on the termination of an error is encountered!!!!
Dear Andrew, I have a similar problem. I am running a set of corner simulations and in some cases due to convergence problem. As soon as convergence problem raises, everything stops and the remaining corner simulations won't be started. May I ask if there is any way that even in case there is convergence issue the thread of corner simulations ...

Posted to Custom IC SKILL (Forum) by Ayrin on Tue, Jul 3 2012

Page 1 of 1 (10 items)

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