AD549 current noise measure setup

Hi,

Measuring current noise in an op amp requires lot of technical expertise. One year back we at our lab was able to determine the current noise of the AD8510 op amp which was used in a very sensitive data acquisition application.

The steps are as follows:

1. Design a test platform in the lab with a total noise floor of less than 8 dB that of the op amp.

2. Remove all the electrical disturbances surrounding the system under test (Farday cages)

3. Use batteries for powering the system set up and use a an amplifier(AC coupled) to raise the op amp's noise floor above the Measurement systems noise floor.

4. Accurately select the measurement device.

There is a pretty good application note from Intersil to deal with this. We used the exact same set up.

Attached pdf is the application note.

Please feel free to ask any clarifications.

Do you have name or title of the intersil application note. I think I read this before but can't put finger which one. 

Do you have name or title of the intersil application note. I think I read this before but can't put finger which one.