[SOLVED] Effect of Notches in layout

[Blue Hawk]

Hi all,

Can anyone please explain me about the effect of notches in layout ? Or kindly provide me any docs or any link.
I've attached the layout view for example.. Here the Metal 1 layer is having notch and DRC will not detect this as an error..

https://obrazki.elektroda.pl/5100627900_1391751730.jpeg

Thanks in advance.
Regards,
Satz

 

[erikl]

... please explain me about the effect of notches in layout ? Or kindly provide me any docs or any link.
I've attached the layout view for example.. Here the Metal 1 layer is having notch and DRC will not detect this as an error..

Actually this isn't a notch. A notch is a hack, nick, recess, chamfer, groove, indent, jag or kerf, i.e. a small missing part in a structure.

From a DRC document:
"Notches are to be considered as spacing and must respect the same minimum values."

 

[Blue Hawk]

Thanks erikl

In the snap what i've attached has the metal not connected properly ( metal is not stopped in the place where it should be ) , Will it cause any problem?

Then, Coming to notches.....
Can u explain me with any images I.e., Snaps of -- metals having notches.
Also i need to know about the effect of notch.

Thanks in advance

 

[erikl]

In the snap what i've attached has the metal not connected properly ( metal is not stopped in the place where it should be ) , Will it cause any problem?

No.

Then, Coming to notches.....
Can u explain me with any images I.e., Snaps of -- metals having notches.

See here an example: **broken link removed**

Also i need to know about the effect of notch.

Mask/photoresist (lithography) resolution isn't good enough to reproduce such tiny structures. DRC would tell you a violation.

 

[Blue Hawk]

Thanks for your response..

I can't view your attachment, It is showing the error message as
" Invalid Attachment specified. If you followed a valid link, please notify the administrator"...

Can you send an valid image again..

 

[erikl]

I can't view your attachment, It is showing the error message as
" Invalid Attachment specified. If you followed a valid link, please notify the administrator"...

Can you send an valid image again..

I can view it without any problem. Here it is again:

 

[dick_freebird]

Notches may fail to print as drawn. This is one of those
violations that's more of a "you're not going to get what
you drew" warning than a "you're going to blow up" error.

Since the verification tool knows nothing of intent, you
get warned regardless.

 

[Blue Hawk]

Thanks erikl and dich free_bird,

" Mask/photoresist (lithography) resolution isn't good enough to reproduce such tiny structures. DRC would tell you a violation. "

From the Above statement (from erikl), I 've understood that,

The metals in the following snaps have no notches and there's no problem with those connections, (If i'm not right, please make me clear)..

https://obrazki.elektroda.pl/9851328800_1392014942.png

And the metals in the below attachment have notches, But DRC will tell this as a violation..

https://obrazki.elektroda.pl/2885710500_1392014978.png

It is OK if i'm right..
Else, Kindly I need some of u to conclude this topic...

Thanks,
Satz

 

[erikl]

From the Above statement (from erikl), I 've understood that,

The metals in the following snaps have no notches and there's no problem with those connections, (If i'm not right, please make me clear)..

https://obrazki.elektroda.pl/9851328800_1392014942.png

Yes, you're right.

And the metals in the below attachment have notches, But DRC will tell this as a violation..

https://obrazki.elektroda.pl/2885710500_1392014978.png

Again, this isn't a notch, because these are 2 different metal layers. Only notches within one layer are flagged.