Re: Missing Schmitt Gates??

On Mon, 03 Dec 2007 19:07:08 -0800, John Larkin wrote:
On Mon, 3 Dec 2007 17:57:28 -0800, "Joel Koltner"
"D from BC" <myrealaddress@xxxxxxxxx> wrote in message

A crystal needs a good linear amp.

Everything is linear if you look closely enough...

I am being a little obtuse here -- the kind of oscillator I was thinking
of was your canoncial microcontroller/FPGA clock that doesn't need to be
particularly accurate -- it's common to use 50 or even 100ppm rocks in
such systems; this is a completely different league of oscillator than
those you build for, e.g., fancy RF applications where you're after
2.5ppm or better.

I was never able to get the Schmitts to oscillate anywhere near the
supposed crystal frequency.


Maybe it's a little late in the thread to bring this up, but I'd
think that with the Schmitt characteristics of the input, the crystal
would have to be drastically overdriven, just to get the gate to
notice that there's a feedback signal.

But I wouldn't have any qualms about an HCU inverter or 3. ;-)

Cheers!
Rich

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