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How to evaluate the large-signal stability of power amplifiers?

Hi, everyone,

I am a student learning to use Cadence' s suite of tools. I wonder how to evaluate the large-signal stability of power amplifier using Cadence' s design tools.

I know that Keysight's ADS software offers a method called WSprobe for assessing the large-signal stability of power amplifiers. But I am also interested in whether Cadence's suite of tools provides a similar functionality or if there are alternative, more effective methods for large-signal stability assessment. I have found that the Kf method is not suitable for our complex circuit, so I am seeking alternative solutions to ensure the stability of our circuits.

If such tools are available in Cadence, I also want to know the detailed information on how to use them, as well as their advantages and limitation. If there are no similar tools within Cadence's offerings, I would also like to know if there are any alternative suggestions or techniques that can help us effectively assess the large-signal stability of power amplifiers using Cadence tools.

Thanks a lot for help!

Regards,

Cai

Tawna over 1 year ago

We don't yet support the Winslow stability probe. You may want to look at hb/hbstb analysis. HB is your large signal analysis, hbstb measures stability in the presence of the large signal.

1. The documentation (pdf format) is located in your software hierarchy in the doc directory:

<path_to_software>/lnx86/doc/spectreRFinExplorer/spectreRFinExplorer.pdf

2. Depending on the version of software you are using, we have the Doc Assistant viewer. Run the cda command from here:

<path_to_Spectre23.1>/lnx86/tools.lnx86/bin/cda

3. (The easiest in my opinion, if you have access). Below is a link to the documentation on Cadence Online Support.

Spectre Circuit Simulator and Accelerated Parallel Simulator RF Analysis in ADE Explorer User Guide -- Frequency Domain Analyses: Harmonic Balance - HBSTB Options
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Tawna over 1 year ago

Microwave Office (another Cadence product, formerly AWR) may support the Winslow Stability Probe. It is not my product area, so I'd need an AE from that team to comment.

best regards,

Tawna
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David Webster over 1 year ago

Hi Cai,

Microwave office offers a wide variety of stability methods for Power Amplifiers. Here you can find the simulation guide pdf: https://kb.awr.com/display/awrfaq/Documentation

In the pdf, we have a section A.5. Stability Analysis Methods. Here you can find information regarding the different stability methods we offer.

Also, if you click File -> Open Example and type stability, you will see some available built-in examples we have for different stability techniques and scenarios.

Thanks,

David Webster
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