Did you check out the new Pnoise and Hbnoise Choosing Analyses forms in the MMSIM 15.1 and IC6.1.7 /ICADV12.2 releases? These forms have been significantly improved and simplified. The Direct Plot Form has also been enhanced and is much easy to use. Let's look at the changes that have been made in the Pnoise and Hbnoise Choosing Analyses forms. Updated Choosing Analyses Forms Below are the Pnoise and Hbnoise Choosing Analyses forms for an oscillator circuit. For both Pnoise and Hbnoise, the sources and modulated options from the Noise Type drop-down list have been replaced with timeaverage , which is a single-sided spectrum and harmonic-referred (modulated) noise analysis. The timeaverage option provides you the following five choices: USB , AM , PM , AM&PM , and ALL(AM,PM,USB,LSB) . The following table shows the noise options that were available in the earlier Pnoise/Hbnoise Choosing Analyses form and the new noise options from the IC6.1.7 and ICADV12.2 releases. Old Form New Form Comments Noise type=sources Noise Type=timeaverage + USB selection The Noise Type=timeaverage + USB selection is similar to the old Noise Type = sources option. Noise Type=modulated Noise Type=timeaverage + AM&PM or ALL(AM,PM,USB,LSB) With Noise Type=timeaverage and ALL(AM,PM,USB,LSB) , you can plot the AM and PM components as well as the total noise. In addition, you can plot phase noise and FM jitter results for oscillators. Plotting is done using the Direct Plot Form. Noise Type=jitter Noise Type=jitter The Noise Type=jitter option only calculates PM jitter for both driven circuits and oscillators. To calculate FM jitter for oscillators, you need to select Noise type = timeaverage + PM or N oise Type=timeaverage + ALL(AM,PM,USB,LSB) from the Pnoise/Hbnoise Choosing Analyses form. Noise Type=timedomain Noise Type=timedomain No change. When Contribution Type is AM , PM , AM&PM , or ALL(AM,PM,USB,LSB) , Sweeptype is automatically set to relative . If you are simulating circuits like switched-capacitor filters or sampling circuits, you may select full-spectrum pnoise. In full-spectrum pnoise, you need not set the Maximum Sideband field except in cases where the PSS beat frequency is 100KHz or less. In such cases, set maximum sidebands to the 1/F noise corner frequency divided by the PSS beat frequency. With the full-spectrum setting, Pnoise calculates all the noise translations it can, based on the maximum timestep in the PSS analysis. If you are simulating oscillators using shooting Pnoise, consider using the new dts option, which improves the close-in phase noise accuracy. This option is available in the Periodic Noise Options form. Updated Direct Plot Form Options Below are the Pnoise and Hbnoise Direct Plot Forms for an oscillator circuit with PM noise type selection. If you choose USB as the contribution type in the Pnoise/Hbnoise Choosing Analyses form, you cannot plot phase noise from the Direct Plot Form. To plot phase noise, you need to select the PM or ALL(AM,PM,USB,LSB) option. In addition, if you run a Pnoise/Hbnoise simulation with ALL(AM,PM,USB,LSB) contribution type, and choose LSB from the Noise Type section and dBc/Hz option from the Modifier section in the Direct Plot Form, the output that you get is like the old “Pnoise/Hbnoise sources phase noise” plot. Both AM and PM components in the Direct Plot Form now have a SSB (single sideband) and a DSB (double sideband) selection. You no longer have to remember whether your plot is SSB or DSB. For more information on performing noise simulation using Pnoise and Hbnoise analyses, you can view the following videos on Cadence Online Support: Performing Noise Simulation in Spectre RF Using the Improved Pnoise and Direct Plot Form Options Introducing the Enhanced hb and Hbnoise Analyses Options in ADE Explorer Click the video links now or visit Cadence Online Support and search for the video under Video Library . Related Resources Spectre® Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer User Guide. Periodic Noise Analysis (Pnoise) Harmonic Balance Noise Analysis (Hbnoise) Comparing Pnoise/HBnoise simulation results in the new MMSIM15.1/IC617(ICADV12.2) GUI to previous versions Improvements to Pnoise/Hbnoise Analysis in MMSIM15.1 and IC6.1.7/ICADV12.2 Demystifying Noise Simulation in RF Circuits Spectre APS and RF Option Note : For more information on Cadence products and services, visit www.cadence.com . About Virtuoso Video Diary Virtuoso Video Diary is an online journal that relays information about Virtuoso videos that are available in the Cadence Online Support Video Library. Hundreds of interesting videos on a wide variety of new and exciting Virtuoso features have already been created. Virtuoso Video Diary brings you direct links to these videos and other related material, on regular basis. Click Subscribe to visit the Subscription box at the top of the page in which you can submit your e-mail address to receive notifications about our latest Video Diary posts. Kamal Kishore Tewari Jommy Thomas![]()
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