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MSG and Stability - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


jkfelix
Post subject: MSG and stability Posted: Sun Feb 12, 2006 11:27 am

Lieutenant

Joined: Thu Feb 09, 2006 5:29 am
Posts: 1
Hi guys,

My transistor is the NE4210S01, bias point VDS = 2 V, ID = 10 mA and at 6 GHz.

I'm doing an availabe gain (Ga) design, keeping my load complex conj of the output reflection, and draw the constant gain circles in the GammaS plane:

I see that the gain circle corresponding to the MSG has some parts inside the stable region. Picking values of GammaS so that I have higher gain than the MSG, I get some GammaL according to the perfect match at the output - and this is also in the stable region! So I have stability both at the input and the output, even though choosing points on having higher gain than the MSG!

Can this be, and if so - why oh why?

sincerely,
RF-student

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Posted  11/12/2012

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