analog and digital grounds

[ankitgarg0312]

even if we make two grounds digital and analog ,our substrate is still common to both..
so through substrates these grounds are connected ...

how does then two grounds benefits us ??
please correct me if i am wrong

 

[karesz]

Hi,
its much wroten over that; such is only phylisophical...
Surrly, their are to separate, minimum to chanalyze, but good placement of both parts of electronics is relevant too...
Strong/& switched current parts are to place far away from sensitive/high impedance or wide bandwith inputs/preamps, ADCs...
Usual common point is at UrefGnd from ADc or input feeding /Gnd form all supply voltages.



K.