On Wed, 09 Mar 2011 18:58:02 -0600, John Fields
wrote:

On Tue, 08 Mar 2011 16:49:07 -0700, Jim Thompson
wrote:

On Tue, 08 Mar 2011 17:27:41 -0600, Jon Elson
wrote:

On 03/08/2011 11:30 AM, Jim Thompson wrote:


I trying to simultaneously get Q and Qbar with equal delay.

I'm concluding the best I can do is fudge some sizing to somewhat
equalize delay paths.
Oh, much better would be to make a differential driver circuit. I'd
suggest some relevant chips, but I think you said you were building it
from primitives.

Jon

I'm doing a high-speed 3.3V to 5V translator, where "5V" may be just
about anywhere 3V to 5.5V ;-)

But I think I've figured out a way to avoid the funny "lumpy" risetime
I'm seeing. Looks like, rather than perfect delay match, sequencing
delay mismatch depending on transition direction may smooth it out.

...Jim Thompson
---
Time shim in one direction but not the other?

---
JF

A supposedly "symmetrical" structure with transition direction
peculiarities. Because of the VDD1/VDD2 "spec" I have to tip-toe
around cautiously ;-)

...Jim Thompson
--
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