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B1f and K in sp Analysis

I was checking stability of a differential single stage amplifier, obviously I had 50-ohm port in 50-ohm port out, I checked K which at some frequencies was below one, which means potentially unstable, but B1f was greater than zero at all frequencies.

Gonzalez microwave book states K>1, |delta|<1 for unconditional stability of a two port, and also states you can combine with B in which if it is greater than 0, is equal to necessary and sufficient condition stated earlier.

My question is how can I know what is B1f in sp analysis? Is there similar approach to spectre -h xxx that I can do to find out?

The B in Gonzalez is 1+|S11|^2-|S22|^2-|delta|^2

ADE flavor : ADE Assembler

SPECTRE_21.10.389

IC06.18

ShawnLogan over 2 years ago

Dear illaoi,

illaoi said:
My question is how can I know what is B1f in sp analysis?

There is both an ocean and ViVA function available to compute B1f (the alternative stability factor).

The ViVA (i.,e available from the Calculator) is documented at URL:

https://support.cadence.com/apex/techpubDocViewerPage?xmlName=vivaxlug.xml&title=Virtuoso%20Visualization%20and%20Analysis%20XL%20User%20Guide%20--%20Calculator%20Functions%20-%20B1f&hash=pgfId-1217359&c_version=ICADVM20.1&path=vivaxlug/vivaxlugICADVM20.1/appD.html#pgfId-1217359

and the ocean version of the command at URL:

https://support.cadence.com/apex/techpubDocViewerPage?xmlName=oceanref.xml&title=OCEAN%20Reference%20--%20Predefined%20and%20Waveform%20(Calculator)%20Functions%20-%20B1f&hash=pgfId-1852349&c_version=ICADVM20.1&path=oceanref/oceanrefICADVM20.1/chap10.html#pgfId-1852349

I hope you now have access to the On-line support site to be able to view these illaoi.

Shawn
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