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shaq
Joined: 23 Jul 2005
Posts: 442
Helped: 92
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 21 Sep 2007 14:07 How to estimate the layout area of the power transistor? |
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Dear all,
Suppose my size of the power transistor is w=900um l=0.7um
If I use the "waffle" style of layout method, how do I estimate the layout area of the power transistor?
(the spacing in a contact to poly gate is 0.4um, the min. gate poly is 0.5um)
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jttzeng
Joined: 05 Dec 2006
Posts: 7
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22 Sep 2007 16:27 Re: How to estimate the layout area of the power transistor? |
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| Do you plan to draw the power mos with how many fingers (m= ?)
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22 Sep 2007 16:27 Ads |
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shaq
Joined: 23 Jul 2005
Posts: 442
Helped: 92
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23 Sep 2007 7:19 Re: How to estimate the layout area of the power transistor? |
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| jttzeng wrote: |
| Do you plan to draw the power mos with how many fingers (m= ?) |
Dear jttzeng,
Suppose that I assume the W=9um L=0.7um M=100 (sorry, this is my first time to draw a power mosfet in a layout in my life, so I don't know how to determine the unit size of the transistor.)
Is it reasonable?
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shaq
Joined: 23 Jul 2005
Posts: 442
Helped: 92
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27 Sep 2007 16:55 How to estimate the layout area of the power transistor? |
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| No body knows?
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mince
Joined: 19 Feb 2005
Posts: 88
Helped: 10
Location: Texas
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27 Sep 2007 20:35 How to estimate the layout area of the power transistor? |
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| Just do some math. I don't know how big your contacts are, but suppose they're .4x.4. If you make the layout 10 rows of 10 fingers each, plus maybe a dummy on each side then you'll have 12 * .7 = 8.4 um in total gate length. For the area between gates, you'll have .4 on each side of the contact plus .4 for the contact = 1.2 um. You'll have 12+1 of these so 13*1.2 = 15.6 um. Total width will then be 15.6+8.4 um = 24 um wide. Height will be 9 u x 10 rows = 90 um. Probably want to add about 10-20% to this number for spacing between rows, so make it 105 um. Total area then will be 105 x 24. That's how you can calculate it....optimize it to however you want it to be, using the correct value for gate to contact distance plus contact width.
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