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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