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davyzhu
Joined: 23 May 2004
Posts: 521
Helped: 3
Location: oriental
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 25 Oct 2004 8:45 Inter-connection Cap v.s. Gate-source Cap |
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Hello all,
I encounter a problem when I use a CMOS model (0.6um, China model) to simulate. My workmate use it to simulate asynchronous circuit. And I found the the calculation equation of the rise time do not include gate-source (or gate-drain) capacitor. I guess the Inter-connection (i.e. between two mos stage ) capacitor outweight gate-source (or gate-drain) capacitor, therefore the Cgs is neglected.
I remember the Cgs is about less than 1pF and how about the normal inter-connection capacitor in 0.6um?
The same question about the two capacitors in 0.18um and 0.13um?
Regards,
Davy Zhu
Last edited by davyzhu on 25 Oct 2004 10:26; edited 1 time in total |
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borodenkov
Joined: 02 Mar 2004
Posts: 129
Helped: 11
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| 25 Oct 2004 9:02 Inter-connection Cap v.s. Gate-source Cap |
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| which model are you using?
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Hughes
Joined: 10 Jun 2003
Posts: 712
Helped: 84
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| 25 Oct 2004 14:26 Inter-connection Cap v.s. Gate-source Cap |
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| Interconnection capacitance is dependent the layout. It is not included in the mosfet model.
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qutang
Joined: 25 Oct 2004
Posts: 315
Helped: 6
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| 25 Oct 2004 15:12 Inter-connection Cap v.s. Gate-source Cap |
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| it's Cgs,the effect is heavy.
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