At 11:26 PM 2/2/2003 -0800, you wrote:
>Doesn't "schmidt trigger" imply some positive feedback to "snap" the
>output/internal gates to a digital state especially quickly, in addition to
>the hysteresis?  (rather than leaving transistors/etc in a possibly linear
>region of operation, prone to oscillations and/or excessive power
>consumption.)  In fact, I thought the hysteresis was a byproduct and/or
>method used to achieve this capability, and the "important" part of a
>"schmidt trigger" was its ability to correctly operate with slowly changing
>(ie analog) input levels...

Yes, that's right. The specs fro the actual amount of hysteresis and the
transition voltages are horribly loose, so using a gate as, say, the
active element in a relaxation oscillator, is fraught with peril.


                               ST
                      .-------|  |
                      '       |& |o-----.---o
                      +----+--|__|      |
                      |    .            |
                  C  ---   |   ___      |
                     ---   '--|___|-----+
                      |         R
                      |
                     ===
                     GND


Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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