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# pnoise

• #### Re: RE: Phase Noise vs frequency graph problem

Hello Tawna, I am very thankful for your reply...Read a lot of posts by you and Andrew in various topics and a fan of your knowledge and work.. I got the correct graph yesterday when I changed errpreset to 'moderate' and putting tstab as 60n..but the values of phase noise was aroung -140dbc/hz...
Posted to Custom IC Design (Forum) by rohan kr on Thu, Mar 29 2012
• #### Re: Phase Noise vs frequency graph problem

Thanks Frank for replying. Yes, I have seen that post-it explains the equation which spectre uses to find the pnoise...but it doesnt help me to get the right graph with negative values of pn. I am doing the pss-pnoise simulation using the following settings: PSS : Harmonic Balance beat freq - 37.93G...
Posted to Custom IC Design (Forum) by rohan kr on Wed, Mar 28 2012
• #### Phase Noise vs frequency graph problem

Hello I am a newbie engineer starting my career in IC design and working on a high frequency oscillator (38 GHz). I am using Cadence IC6.1.5-64b.500 version and using spectre simulator for the schemtic design and simulations. I am having doubts about my 'pnoise' analysis. All the research papers...
Posted to Custom IC Design (Forum) by rohan kr on Wed, Mar 28 2012
• #### Jitter from pnoise simulation

I'm desinnig a Time to digital converter and I would like to simulate the jitter of a driven buffer having a rising time of 350 ps. In my schematic, the buffer is driven by vpulse (ideal CLK @ 2 MHz) and I would like to simulate his output jitter. My setting of pss simulation is as follow: Beat frequency...
Posted to RF Design (Forum) by moez on Fri, Mar 9 2012
• #### Why is the Noise Factor that I've counted inconsistent with the result of Pnoise?

Hi everyone, I've simulated the noise factor of Mixer ne600p in rfExamples library with PSS+Pnoise. With the Noise Summary printed, I calculated the Noise Factor, which is (total noise at output - load noise at output)/(source noise at output), then Noise Figure can be abtained with 10*lg(Noise Factor...
Posted to RF Design (Forum) by xxgeneral on Thu, Feb 16 2012
• #### SpectreRF AppNotes and Tutorials....Still One of our Best Kept Secrets!

Some of you may remember the blog written several years ago " Shhhhh...SpectreRF Tutorials and AppNotes - One of Our Best Kept Secrets ". Well, the more things change...the more things stay the same! The location of these tutorials and appNotes still seems to be one of our best kept secrets...
Posted to RF Design (Weblog) by Tawna on Mon, Jan 16 2012
• #### How to run Pnoise simulation with ocean

Hi everyone, I have written an oceanscript to run pnoise. I am loading into CIW but I am getting "cannot handle (nil-0)" error in CIW window. After trying lots of things, I have directly saved the Spectre Oceanscript from ADE and tried to load it also but I have got same problem. Then, I have...
Posted to Custom IC SKILL (Forum) by yayla on Mon, Dec 26 2011
• #### Guidelines for Setting Pnoise/HBnoise Sidebands to Get Accurate Results

I get quite a few questions from designers along the lines of "How do I set the number of pss/hb harmonics and pnoise/hbnoise sidebands in order to get accurate results?" Here are some general guidelines that I follow: The number of sidebands ( harmonics ) in the simulation can affect performance...
Posted to RF Design (Weblog) by Tawna on Fri, Aug 5 2011
• #### Q&A: TI Wireless Team Describes Advanced Phase-Noise Characterization for RF Oscillators Using SpectreRF

In this interview, members of the Texas Instrument wireless group talk about the characterization effort initiated and completed last year between Cadence and IBM using TI RF designs as a pilot. The goal between the two teams was to optimize SpectreRF usage to successfully and efficiently simulate TI...
Posted to RF Design (Weblog) by helenet on Wed, Jun 15 2011
• #### Re: half harmonic frequency in PSS analysis

Hallo, I actually have a similar problem without having subharmonics in the VCO, I am only simulating the LC VCO. The estimated frequency from the PSS analysis is the same like what I expect and the same which I get from the dft of the tstab transient signal. However when the PNOISE runs I get a lower...
Posted to RF Design (Forum) by aamar on Mon, Jun 6 2011
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