[sdiy] A question about regulator noise figures

Tom Wiltshire tom at electricdruid.net
Tue Mar 16 01:29:24 CET 2021


Aah! OK, thanks Brian. Yes, flicker noise I know about, but I hadn’t made the connection.

I still don’t understand the units though. How could I convert a flicker noise measurement like 8uV/Hz to a RMS measurement across a given bandwidth like the other data sheets offer? Is that even possible? I’m starting to suspect some manufacturers don’t *want* me to be able to compare specs with their competitors! ;)

Tom 

==================
       Electric Druid
Synth & Stompbox DIY
==================



> On 16 Mar 2021, at 00:05, Brian Willoughby <brianw at audiobanshee.com> wrote:
> 
> 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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