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TerryC 22nd January 2006 11:50 PM

Regulator Output Noise Voltage Spec
Can someone tell me why the output noise voltage specification is sometimes given as volts, and other times given as volts/Vout? Specifically I'm refering to the 78XX/79XX family of fixed voltage regulators. One manufacturer will spec it as 90uv, and another manufacturer will spec the regulator as 90uv/Vout. I can't believe that one regulator can be so much better/worse than the other.

Stocker 23rd January 2006 03:27 AM

believe it. also, that may be one source that just left off the '/vout' part of the units...

search for (IIRC) "finessing voltage regulator noise" which is a nifty paper from Wenzel Assoc., who know about low noise stuff. Also search the forums here as this sort of topic has been discussed before.

davidsrsb 23rd January 2006 04:46 AM

Variable regulators noise level increases as the voltage is increased, so the V/V spec makes sense, just multiply the output voltage by this figure.

Fixed regulators like a 7805 can just give a level in Volts.

Of course the V/V figure looks better at a glance

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