Placement matters: what
happen when a decoupling capacitor being placed far far away from the IC that
it is supposed to decouple? Compare diagram below to those in previous posts:
This time, I have removed all
traces that that is not related to positive supply decouling capacitor
discharge path. Obviously in this placement, the decoupling capacitor discharge
path is much longer that those in posts stated above. In this case there are much larger series
inductance that discourage good decoupling performance (as it is more
troublesome for capacitor to discharge).
Top view of top signals –
positive supply decoupling capacitor discharge path
great!!
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