Other Parts Discussed in Thread: INA159
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Hi Yue Tang,
Here are my several ideas:
1) please first check the ripple voltage of each IC's VDD.
2) The bead and filter capacitors are needed for each IC's power supply. and try to use different beads and filter caps for different frequency suppress.
3) Does the mentioned metal shielding covered whole power module? and if the shielding connected to ground?
another method you can try is to shield the IC which been interfrenced respectively.
4) I recommend to test EMI (CE & RE) to check if it out of standards' spec..
Thanks for the reply. What is your suggestion to do the ripple test? Is there any material to show how to do the ripple test right.. Actually, They said they did test the ripple before, but no abnormalities were found. I can ask them to do the test again following your suggestion. thanks