Measuring 2-Tone Intermodulation Using Envelope-Following Analysis
By
Tawna Wilsey
on
May 16, 2012
From time to time, SpectreRF users simulate very large, extracted-view circuits in 2+ tone QPSS. In many of those cases, memory requirements exceed the available resources. When that happens and small-signal approximations aren’t applicable, the
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Guidelines for Maximizing Speed vs. Accuracy in SpectreRF simulations - Part 3
By
Tawna Wilsey
on
March 7, 2012
Several months ago, I started a 3 part series on Guidelines for Maximizing Speed vs Accuracy for Harmonic Balance simulations. Today, I'll discuss part 3 of the 3 part series consisting of: Which Engine: Spectre or APS? Oversample vs Number of Harmonics
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SpectreRF AppNotes and Tutorials....Still One of our Best Kept Secrets!
By
Tawna Wilsey
on
January 16, 2012
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
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Nport Application Note has been Updated and Re-Released
By
Tawna Wilsey
on
January 3, 2012
Happy New Year! After many requests, I set aside some time and updated the Using the nport in Spectre and SpectreRF Simulations appNote for MMSIM 11.1. You may download the appNote on Cadence Online Support . More nport enhancements are planned, so stay
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Guidelines for Maximizing Speed vs Accuracy for Harmonic Balance - Part 2
By
Tawna Wilsey
on
November 1, 2011
I am often asked for guidelines on maximizing speed vs. accuracy for SpectreRF harmonic balance simulations . Today, I'll discuss part 2 of the 3 part series consisting of: Which Engine: Spectre or APS? Oversample vs Number of Harmonics Harmonic Trimming
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Guidelines for Maximizing Speed vs Accuracy for Harmonic Balance - Part 1
By
Tawna Wilsey
on
October 7, 2011
Greetings, I am often asked for guidelines on maximizing speed vs. accuracy for SpectreRF harmonic balance simulations. In a series of 3 blogs, I'll discuss some of the "knobs" that you can tweak, those being: * Which Engine: Spectre or
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Guidelines for Setting Pnoise/HBnoise Sidebands to Get Accurate Results
By
Tawna Wilsey
on
August 5, 2011
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
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My Favorite nport Settings for Spectre and SpectreRF
By
Tawna Wilsey
on
March 23, 2011
The nport component located in analogLib can be used in circuits for Spectre and SpectreRF simulations. It is a scattering parameter (S-parameter) based distributed multi-port element. The nport truly is a "black box"… It can be used
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Tips for Simulating a Transmit Mixer in SpectreRF
By
Tawna Wilsey
on
March 10, 2011
Some typical questions that I receive from newer SpectreRF users are: How do I simulate a transmit mixer? How do I look at both upper and lower sidebands? How do I set up my simulation for PAC and Pnoise? When I plot my data, how do the indexes correspond
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New Fast Envelope in MMSIM10.1 is *Really* Fast and Accurate!
By
Tawna Wilsey
on
November 15, 2010
Traditionally, envelope analysis is used to simulate circuits with modulated inputs. Envelope analysis is much faster than transient simulation, and is used for simulating spectral regrowth. Regular envelope analysis is "brute force" transistor
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