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Dependance of stability margins on the gain of Mixer? (Read 1884 times)

iVenky Senior Member Offline Posts: 101 Silicon Valley	Dependance of stability margins on the gain of Mixer? Apr 01^st, 2013, 7:20am I read that gain of the Mixer should not be high as it would degrade the stability margin. How can the gain degrade stability? Please clear me this doubt. Thanks a lot.
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aaron_do Senior Fellow Offline Posts: 1398	Re: Dependance of stability margins on the gain of Mixer? Reply #1 - Apr 7^th, 2013, 8:24pm Hi, I haven't heard that about the mixer in particular, but definitely blocks with higher gain are more prone to instability. There may be an unanticipated feedback path through coupling for example... regards, Aaron
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raja.cedt

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Re: Dependance of stability margins on the gain of Mixer?
Reply #2 - Apr 8^th, 2013, 3:24pm

hello,
Most likely systems with high gain will have a tendency to oscillate due to parasitic coupling for instance power amplifier power may coupled through substrate or bond wire inductance to LNA input this may create oscillations. In few cases lower gain may oscillate, so you have to check K-factor.

Thanks,
Raj.

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