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lastdance
Joined: 01 Feb 2005
Posts: 105
Helped: 17
Location: Singapore
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 01 Feb 2005 7:42 Waffle v/s Stripped Layout |
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For the layout of large power transistors,
what are the advantages/disadvantages of using stripped/waffle layout for MOS devices. Thanks
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Humungus
Joined: 10 Jul 2001
Posts: 417
Helped: 25
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| 01 Feb 2005 11:04 Re: Waffle v/s Stripped Layout |
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| A power device can have an equivalent W of several centimeters. As you cannot make a so long device you divide it into fingers. Also, you reduce the parasitic resistance in series with your transistor due to long access metal stripes.
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Colbhaidh
Joined: 10 Aug 2004
Posts: 145
Helped: 16
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| 01 Feb 2005 13:20 Re: Waffle v/s Stripped Layout |
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| Waffle is typically used for high voltage discrete FETs (like 100V ++) which are vertical transistors.
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Teddy
Joined: 15 Sep 2004
Posts: 281
Helped: 38
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| 02 Feb 2005 0:54 Re: Waffle v/s Stripped Layout |
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| Waffle makes more W per area. What I did not like on it was the fact of 1 contact / cell (sure depends how you make it). If this contact is not done well in process you are loosing quite a bit of W.
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hrkhari
Joined: 04 Mar 2004
Posts: 225
Helped: 3
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| 05 Feb 2005 5:45 Re: Waffle v/s Stripped Layout |
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Hi Guys:
In context of high current draining transistor, typically in PA design, waffle layout technique would serve the purpose, the method of distributing the large transistor in sharing the drain and source in a tiled layout view utilized in waffle layout technique provides better current and thermal management effort. Hope this helps
Rgds
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LaughingMAN
Joined: 22 May 2004
Posts: 11
Location: Malaysia
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| 23 Dec 2005 4:20 Re: Waffle v/s Stripped Layout |
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Hi All,
Where can I find an example of a waffle layout technique? Thanks.
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scottieman
Joined: 08 Aug 2005
Posts: 133
Helped: 11
Location: On Top of Silicon
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| 25 Dec 2005 15:42 Re: Waffle v/s Stripped Layout |
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Hi all,
As I known from my collegue, transistor in waffle sturcture, generally, cannot be recongized in LVS. Any one know how this problem can be solved?
Thanks
Scottie
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selvaraja
Joined: 01 Jun 2004
Posts: 210
Helped: 3
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| 08 Jul 2008 6:16 Re: Waffle v/s Stripped Layout |
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| you need modify lvs script to make it wrk
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vijay.kumarreddy
Joined: 06 Jan 2006
Posts: 78
Helped: 3
Location: Hyderabad,India
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| 08 Jul 2008 10:21 Re: Waffle v/s Stripped Layout |
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| in the waffel structure u cannot guarentee the width the of the edge fingers.this is the main disadvantage of the waffel structure
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