On Tue, 23 Sep 2008 08:33:04 -0700, Jim Thompson
wrote:


On Tue, 23 Sep 2008 08:18:58 -0700, John Larkin
wrote:

On Tue, 23 Sep 2008 08:07:40 -0700, Jim Thompson
wrote:


I need to convert a _slow_ moving analog signal to "1" or "0",
depending on whether it is above or below the digital threshold
(CMOS).

Problem: If I go directly into a gate or D-input of a flop I can get
substantial overlap current rail-to-rail.

This is a very low current application.

Any suggestions?

...Jim Thompson

What's the technology... discrete or inside an IC?

Inside an IC, I'm designing it.


How low is "low current"

1uA


Speed/hysteresis requirements?

I have ~10us to make a decision, no hysteresis (yet).


What's the input signal level?


John


0V-to-3.3V CMOS levels, out of a _very_ slow comparator.


I'd be tempted to use the power of the input signal, so common gate
input structure is used to achieve simple voltage gain.

The output may look indeterminant, but it's not, it's just slow.

RL