Metal Wire sizing in Layout

[AdvaRes]

Hi Members,


I need your help to define the appropriate width of the metal wire in Layout.
I mean by "appropriate width": The minimum width needed to not make the circuits heat. In fact this is very important since using narrow wire eases Routing and sometimes enable using less metal layers.
I know that the computation depends on the current that will flow inside the wire and the geometric dimension of the cross-section of the wire.

In my case (0.18 µm process) I have a 2µA current but I dont know the Wire cross section dimesion. Can you help ?

 

[dalraist]

As you said, it is depending on process and current value.
I would say that with 2ua you'll never have any kind of problem even with minimum metal width.
A dummy rule is 1mA every um of metal width.
I'm talking about M1. For metal above M1 is even better.

 

[gafsos]

CHEK UR DRM (Design Rule Manual) for 180nm ,

Electromigration Part


A+

 

[alvays]

Hi, AdvaRes,

As dalraist said, you needn't worry about this, especially this tiny current. In PA or ESD, there maybe large current radiating heat.

 

[mviswa]

Hi ,

For any process fab will give a current density for each metal in per micon like µamps/u. if you want route 2µA signal first decide the which metal to route & the take fab given spec for current density. calculate width required by deviding actual routing current by current density for that metal.

Hi Members,


I need your help to define the appropriate width of the metal wire in Layout.
I mean by "appropriate width": The minimum width needed to not make the circuits heat. In fact this is very important since using narrow wire eases Routing and sometimes enable using less metal layers.
I know that the computation depends on the current that will flow inside the wire and the geometric dimension of the cross-section of the wire.

In my case (0.18 µm process) I have a 2µA current but I dont know the Wire cross section dimesion. Can you help ?

 

[hbk2222]

u should check the DRC file for the current density of the wire but for a 2uA i think the minimum width it good but the IR drop will be high