How to measure the DC noise?

Hi, all,

How to measure the DC noise performance, say the LDO, BG output noise? what equipment can be employed?

Thank you very much,
Ruri

to know the amount of the noise and it's spectral density You may use the FFT Analyzer ( also called Dynamic Signal Analyzer or Low Frequency Spectrum Analyzer).

To know how much the noise is "white" and gaussian You have to sample, store and then perform the Allan Variance

Depending on the spectral bandwidth of interest, a fast system multimeter could be used with FFT processing, e. g. in spreadsheet program or any available measurement tool (Labview or whatever).