Ground connection in Mixed signal IC design

[tony_taoyh]

mixed-signal guard ring

Hi,

How to connect the substrate in the following drawing?
(A,B,C,D)


Thanks.

Tony

 

[tlihu]

A-to-B-to-PAD (AGND pin)

C-to-D-to-PAD (DGND pin)

 

[tony_taoyh]

Are you mean to short the digital ground with its bulk connection, also the pad ring?

Thanks.

 

[tlihu]

Are you mean to short the digital ground with its bulk connection, also the pad ring?

Thanks.

Usually pad ring is connecting to DGND. If so, my answer is yes.

 

[banihashemi]

if you have enough pins the best performance is
connecting each A,B,C and D outside the chip
together.

 

[protonixs]

it is better if the guard ring of the digital part doesnt enclose the analog part.