What happens to an LNA noise figure when operated in saturation? I understand that there will be gain and linearity issues, but what about its noise figure? What is the mechanism which will lead to its deterioration?
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\$\begingroup\$ Cesar, are we done with this Q and A session now? \$\endgroup\$– Andy akaCommented Apr 27 at 15:26
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What happens to an LNA noise figure when operated in Saturation
Noise figure is defined as the ratio of the input signal-to-noise ratio to the output signal-to-noise ratio so, if the output moves towards saturation then: -
- both signal and noise may reduce by the same amount or,
- the clipping/saturation may allow noise to remain more dominant whilst the signal reduces or,
- the noise may reduce more than the signal
In other words, it cannot be generally determined; you need to perform specific signal and circuit analysis to decide what might actually happen. May I suggest you use a simulator and try this out for yourself.
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\$\begingroup\$ I'm trying to think of a scenario where the noise figure would actually go down under this scenario? \$\endgroup\$– JasonCommented Mar 18 at 18:20
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