[sdiy] A question about regulator noise figures

Brian Willoughby brianw at audiobanshee.com
Tue Mar 16 01:05:45 CET 2021


Look up the tern, 1/f noise, a.k.a. Flicker noise.

That sort of noise seems to be reported in V/Hz. In this case, it's µV/Hz.

https://en.wikipedia.org/wiki/Flicker_noise

Brian


On Mar 15, 2021, at 16:57, Tom Wiltshire wrote:
> Hi All,
> 
> I’ve been reading data sheets for linear regulators, and I’ve got a question.
> 
> Some regulators specific the output noise voltage from 10Hz to 100KHz as an RMS level, usually uV. However, the Microchip MCP1702 specifies an output noise figure as 8 uV/Hz. What does this mean? What’s the relationship between uV/Hz and RMS uV?
> 
> Here’s the datasheet:
> 
> https://4donline.ihs.com/images/VipMasterIC/IC/MCHP/MCHPS03366/MCHPS03366-1.pdf?hkey=6D3A4C79FDBF58556ACFDE234799DDF0
> 
> Thanks for any guidance!
> 
> Tom




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