Cadence® system design and verification solutions, integrated under our System Development Suite, provide the simulation, acceleration, emulation, and management capabilities.
System Development Suite Related Products A-Z
Cadence® digital design and signoff solutions provide a fast path to design closure and better predictability, helping you meet your power, performance, and area (PPA) targets.
Full-Flow Digital Solution Related Products A-Z
Cadence® custom, analog, and RF design solutions can help you save time by automating many routine tasks, from block-level and mixed-signal simulation to routing and library characterization.
Overview Related Products A-Z
Driving efficiency and accuracy in advanced packaging, system planning, and multi-fabric interoperability, Cadence® package implementation products deliver the automation and accuracy.
Cadence® PCB design solutions enable shorter, more predictable design cycles with greater integration of component design and system-level simulation for a constraint-driven flow.
An open IP platform for you to customize your app-driven SoC design.
Comprehensive solutions and methodologies.
Helping you meet your broader business goals.
A global customer support infrastructure with around-the-clock help.
24/7 Support - Cadence Online Support
Locate the latest software updates, service request, technical documentation, solutions and more in your personalized environment.
Cadence offers various software services for download. This page describes our offerings, including the Allegro FREE Physical Viewer.
The Cadence Academic Network helps build strong relationships between academia and industry, and promotes the proliferation of leading-edge technologies and methodologies at universities renowned for their engineering and design excellence.
Participate in CDNLive
A huge knowledge exchange platform for academia to network with industry. We are looking for academic speakers to talk about their research to the industry attendees at the Academic Track at CDNLive EMEA and Silicon Valley.
Come & Meet Us @ Events
A huge knowledge exchange platform for academia. We are looking for academic speakers to talk about their research to industry attendees.
Americas University Software Program
Join the 250+ qualified Americas member universities who have already incorporated Cadence EDA software into their classrooms and academic research projects.
EMEA University Software Program
In EMEA, Cadence works with EUROPRACTICE to ensure cost-effective availability of our extensive electronic design automation (EDA) tools for non-commercial activities.
Apply Now For Jobs
If you are a recent college graduate or a student looking for internship. Visit our exclusive job search page for interns and recent college graduate jobs.
Cadence is a Great Place to do great work
Learn more about our internship program and visit our careers page to do meaningful work and make a great impact.
Get the most out of your investment in Cadence technologies through a wide range of training offerings.
Overview All Courses Asia Pacific EMEANorth America
Instructor-led training [ILT] are live classes that are offered in our state-of-the-art classrooms at our worldwide training centers, at your site, or as a Virtual classroom.
Online Training is delivered over the web to let you proceed at your own pace, anytime and anywhere.
Exchange ideas, news, technical information, and best practices.
The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information.
It's not all about the technlogy. Here we exchange ideas on the Cadence Academic Network and other subjects of general interest.
Cadence is a leading provider of system design tools, software, IP, and services.
In SpectreRF documents I have come across "Strobed Periodic Noise simulation in SpectreRF" for Synchronous Jitter measurement.
But in Pnoise analysis I have not seen Strobed option.
So what is Strobed Periodic Noise simulation in SpectreRF ?
The tdnoise option (at the bottom of the pnoise form, where it says noise type - default is "sources") is the strobed periodic noise analysis.
Note that for jitter you can also pick the jitter noise type; this uses tdnoise (for a driven circuit, or for an oscillator if you pick PM jitter rather than FM jitter) by identifying the points to sample the noise based on a threshold crossing.
In reply to Andrew Beckett:
Thanks a lot for your reply.
I understood the modulated and jitter option.
But what is tdnoise option ? How it is differnt from the other two?
Can you please throw some light on it.
In reply to RFStuff:
You could run cdnshelp and search for tdnoise ...
At a high level, it inserts an ideal sampler at the output of the circuit which samples the noise at the time instants you specify; you can either give specific time points during the period, or ask it to output every nth point (using skipcount) or specify the total number of time points you want. At each of these time instants, it does a pnoise. This allows you to see how the noise varies throughout the period, rather than computing the time-averaged noise over the period (which is what normal "sources" mode does). If you know the noise at a switching transient, and also know the slope of the signal at the same time, the jitter can be computed - this is what jitter mode does for you.
After reading through spectreRF(latest manual), I have following confusions:-
If I enter total number of timepoints let's say 4 and the PSS total timepoints=400, then tdnoise takes which timepoints ?
2:- For a stand alone Oscillator relative harmonioc is set to 1, for doing pnoise analysis using Modulated, Jitter and tdnoise.
But for driven circuit, the relative harmonic is set to 0 ( while sweeptype is kept relative) for Modulated,Jitter and tdnoise.
This I am not able to understand. Why this differnce from Oscillator.
What I am thinking is:- Let's say Modulated PM analysis for driven Circuit. The Phase noise is due to fc+fm & fc-fm components.
Where fc is the center/output frequency ( PSS beat freq) of the driven circuit & fm is onepoint of the sweep frequncy.
So the output noise frequency is calculated with respect to ( relative) to fc. So relative harmonic shoould be 1 NOT 0.
But then why relative harm=0 set in the document for driven circuit.
For answer to second query, I am not able to understand the first sentence of it.
I think what you are trying to say is for driven circuit (let's say a simple buffer is driven by a square clock of frequency fc), the relative harmonic No. entry doesn't matter. i.e. if you enter 0 or 1 or 2 or anything else doesn't matter for jitter and tdnoise analysis.
But for modulated PM analysis it should be 1.
Am I right on this ?