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

About this list Date view Thread view Subject view Author view

From: D. C. Sessions (dc.sessions@vlsi.com)
Date: Tue Apr 18 2000 - 10:24:57 PDT


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

**** To unsubscribe from si-list or si-list-digest: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu ****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Thu Apr 20 2000 - 11:36:13 PDT