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.
I simulated a simple LC oscillator noise ( PSS+PNOISE) at the oscillator output ( IC5141, .sub-version 126.96.36.1992.isr5).
I have also saw the topic "Explain the differences between the 4 noisetype settings for pnoise". But it could not answer what I want.
I used Shooting Method for PSS. I actually wanted to find the AM Noise & PM noise component separately. For total output noise I used PSS+PNOISE analysis. The noise power in db10 looks ok as it is matching the analysis. And it is a Single Sided PSD.
I have attached the waveform of it as Total-Noise.png
However, when I tried to plot AM noise component and PM Noise component separately I faced a really horrible experience. It is really confusing !!
Could anybody please clarify the following. It will be really helpful not only for me but also for many other designers.
First of all the plot form format in pnoise -source-modulated is very different form.
a) Power is being plotted in absolute value? why not in db10 like Pnoise ( is it because of IC5141 )
b) dBV option is there unlike PNOISE form. Why ?
c) USB, LSB, AM & PM
What is USB:-
is it total noise (AM+PM) in Fcenter + Fif ? ( is it Single sided or double sided PSD )
What is LSB :-
is it total noise in Fcenter - Fif ? ( is it Single sided or double sided PSD )
What is AM:-
Is it only AM noise component ?
is it ( Single-Sided or Double Sided PSD ) As there is dbV I suspect it is all Single Sided PSD ) ?
is it possible to plot AM Noise in Fcenter + Fif band & Fcenter - Fif band ?
What is PM:-
Is it only PM noise component ?
Is it ( Single-Sided or Double Sided PSD ) ?
Is it possible to plot AM Noise in Fcenter + Fif band & Fcenter - Fif band ?
When I plotted the AM noise ( I have captured it in the figure as AM-Noise_dBV.png ), It didn't match the analysis in the lower frequncy range. I plotted in dBV as when I Plotted it gives me -ve value also below 1MHz ( attached as AM-Noise-Power.png).
Beyond 10MHz it was matching with analysis. Also I am finding a NOTCH in the AM-PSD why is this ?
When I plotted the PM noise ( I have captured it in the figure as PM-Noise_dBV.png ), itis exactly folllowing the total -power as drawn in pnoise analysis but with around 3-dB less
AM-Noise_dBV.png is attached here
In reply to RFStuff:
AM-Noise_Power..PNG is attached here
PM-Noise-dBV.png Attached here
Hi RF Stuff,
This sort of thing should really be addressed by contacting Cadence Customer Support (http://support.cadence.com ) rather than on the forum.
I cannot answer these questions at the moment (I have my "day job" to attend to! <grin>) but I strongly recommend that you look at the MMSIM12.1.1 SpectreRF documentation on Cadence Online Support. It is really thorough and explains a lot of these terms.
A link to this is:
Customer Support Director - Analog/Mixed-Signal/RF AEs
Cadence Design Systems, Inc.