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RF Noise - Do you notice the RF noise floor has greatly increased with the influx of wall warts?

Cquk

I would be interested to see if any one else has noticed the issue. Maybe if you work on RF devices / have a spectrum analyiser etc.

Even some bench PSU's seem to produce more EMI than i would expect. 

I am working on adding Ferrite's to all my cables but where does it stop?

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  • I suspect that a noisy supply would manifest itself in the form of amplitude modulation which could raise the noise near any RF tones you're creating.  It also wouldn't surprise me if you're seeing side bands at the frequency produced by the converter used inside the wall wart.  Often linear regulators will go a long way to clean some of this up.  One application area where the noise floor sufferers is if you have a log amp or something like that that doing wide-band detection.  In the past I found that particularly challenging in terms of elevated noise floor.

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  • I suspect that a noisy supply would manifest itself in the form of amplitude modulation which could raise the noise near any RF tones you're creating.  It also wouldn't surprise me if you're seeing side bands at the frequency produced by the converter used inside the wall wart.  Often linear regulators will go a long way to clean some of this up.  One application area where the noise floor sufferers is if you have a log amp or something like that that doing wide-band detection.  In the past I found that particularly challenging in terms of elevated noise floor.

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