Re: [SI-LIST] : AC Coupling vs DC Coupling

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From: D. C. Sessions (dc.sessions@vlsi.com)
Date: Tue Apr 18 2000 - 17:41:05 PDT


Chris Cheng wrote:
>
> not if u have on die decoupling cap between the vss and predriver
> power.
> chris

You like that trick too, huh?

> -----Original Message-----
> From: D. C. Sessions [mailto:dc.sessions@vlsi.com]
> Sent: Tuesday, April 18, 2000 10:25 AM
> To: si-list@silab.eng.sun.com
> Subject: Re: [SI-LIST] : AC Coupling vs DC Coupling
>
> Josip Popovic wrote:
>
> > #2. The same gnd voltage drop would tend to decrease conductivity of the
> > N channel output transistors, however most of output stages have a pre
> > driver section that is referenced to the same gnd. This in return would
> > give that voltage of the gate of the N channel transistor to the
> > transistor source is differentially always the same. Consequently #2 is
> > not of such importance as #1.
>
> Except that the gate pulldown devices (predriver N-channel) aren't the
> ones driving the pulldown gate (final N-channel) on high-to-low transitions.
> The final gate is being driven from the positive rail, and rising source
> (ground) potentials come out of Vgs with quadratic impact on channel
> currents.
>
> --
> D. C. Sessions
> dc.sessions@vlsi.com
>
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-- 
D. C. Sessions
dc.sessions@vlsi.com

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