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

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From: Chris Cheng (chris.cheng@3pardata.com)
Date: Tue Apr 18 2000 - 13:25:26 PDT


not if u have on die decoupling cap between the vss and predriver
power.
chris

-----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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