Re: Missing Schmitt Gates??

On Wed, 05 Dec 2007 10:14:44 -0600, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:

On Tue, 04 Dec 2007 16:47:14 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Tue, 04 Dec 2007 16:45:54 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote:

A crystal oscillator using an inverter with hysteresis WILL NOT
self-start.

...Jim Thompson


Of course it will self-start. It just won't run anywhere near the
crystal frequency!

---
It _might_ not. From Speff:

http://download.intel.com/design/mcs51/applnots/23065901.pdf

I was referring to making an xo from a "standard" schmitt gate. Maybe
it can be done, but it's very risky. There would be two oscillation
modes, and all sorts of things could prevent the xo mode from kicking
in.

John

.

Relevant Pages

  • Re: Missing Schmitt Gates??
    ... ...Jim Thompson ... Of course it will self-start. ... That's why we don't do it that way, and I think Jim was referring to ... self-starting on the right crystal frequency, ...
    (sci.electronics.design)
  • Re: Missing Schmitt Gates??
    ... ...Jim Thompson ... Of course it will self-start. ... From Speff: ...
    (sci.electronics.design)
  • Re: Missing Schmitt Gates??
    ... Of course it will self-start. ... I was referring to making an xo from a "standard" schmitt gate. ... That's why we don't do it that way, and I think Jim was referring to ... self-starting on the right crystal frequency, ...
    (sci.electronics.design)