[SI-LIST] Re: how to model an oscillator ?
- From: Jack Stone <mediwheel_js@xxxxxxxxx>
- To: a.ingraham@xxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Wed, 2 Jul 2003 17:05:31 -0700 (PDT)
Andrew,
Actually the output drivers and standby is not as easy as it may
seem. You really need the impedence and strength etc...of the driver
otherwise your result will be inaccurate - ie multidrops, timing skew
from output to output.
jack ~
--- "Ingraham, Andrew" <a.ingraham@xxxxxxxx> wrote:
> This depends on whether you wish to model the output of a packaged
> oscillator (that happens to have a crystal inside it), or an oscillator
> circuit that has pins for attaching a separate crystal.
>
> If the former, many packaged oscillators with digital outputs, use a
> semi-standard logic gate to drive the output pin; for example, the
> equivalent of a 74HC00 gate. If they won't give you a model, then ask them
> if they can tell you what buffer type they use, then track down a model for
> that gate; it's not ideal but it's better than nothing. The package
> parasitics are another matter. If the vendor won't help, then you may be on
> your own.
>
> Regards,
> Andy
>
>
>
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