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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
