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Noise figure of a direct conversion receiver - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

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 Post subject: Noise figure of a direct conversion receiver
Posted: Tue Jul 10, 2007 4:35 am 
 
Lieutenant

Joined: Tue Jul 10, 2007 4:08 am
Posts: 1
Hello Everybody,

I have a question regarding noise figure of a direct conversion receiver. (zero IF frequency with I & Q outputs),

Should a single sideband or double sideband noise figure measurement be used for this type of receiver & what is the logic behind this?

I get as far as the signal & noise from the desired signal frequency & its image (another part of the required band) coming through the mixer and IF signal and noise powers going up by 3dB due to the 2 adding. But when the baseband resolves the two signals, do they both have a 3dB SNR degredation due to the noise being random & not able to be resolved - or do I and Q noises somehow cancel?

Thanks,
Andy Bothwell




Posted  11/12/2012

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