Thread: Quad 303
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Old 23rd Sep 2017, 2:58 pm   #11
Radio Wrangler
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Location: Fife, Scotland, UK.
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Default Re: Quad 303

Noise issues get more complex when reactive source impedances get involved (achtung! bad pun alert!)

The RF world has had to handle this issue. Reactive impedances are free of thermal noise, but the noise behaviour of an active device is affected by them, so RF devices (well-documented ones at least!) have Smith charts of complex source impedance with contours of constant noise figure plotted on them.

David
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