[time-nuts] Low noise power supplies?

Adrian rfnuts at arcor.de
Thu Jan 31 19:51:33 EST 2013


Charles,

thanks for posting. That is the LTC application note I had in mind.

And here is Bruce's contribution to low noise PS design and measurement:

http://www.ko4bb.com/~bruce/LowNoisePowerSupplies.html

Don't miss to scroll fully down. There is a link to an IEEE paper 
discussing chemical battery noise measurement.

Adrian


Charles P. Steinmetz schrieb:
> tvb wrote:
>
>> I'll answer the question with anther question -- how does one 
>> properly measure power supply noise? Does it boil down to a single 
>> number, a couple of key numbers, or is it a plot, or several plots?
>
> There are a number of "standard" ways, some of which have been 
> mentioned by others, none of which is all that helpful IMO.
>
> What I find most useful is a plot of noise density vs. frequency from, 
> say, 0.1 Hz to as high as you require.  The data should be taken and 
> processed with sufficient frequency resolution to show any spurs in 
> the band of interest.  It is often helpful to have several plots, each 
> covering part of the band of interest, to improve the displayed 
> resolution of spurs.
>
> NOTE:  Designing a preamp for collecting the data is far from 
> trivial.  Articles have been written about it (see, for example, 
> Linear Technology Application Note 124 by Jim Williams 
> <www.linear.com/docs/28585>).
>
> Best regards,
>
> Charles
>
>
>
>
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