[SI-LIST] Re: Decoupling for PLL
- From: steve weir <weirsp@xxxxxxxxxx>
- To: a.ingraham@xxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 30 Aug 2004 06:42:10 -0700
Andy, agreed.
Steve.
At 09:23 AM 8/30/2004 -0400, Andrew Ingraham wrote:
> > Tom, given Zhangkun's observation that substitution of an R for the L in
> > the power feed "fixes" the PLL, I think it is safe to say that the problem
> > is power related.
>
>True ... however, we still don't know the nature of the failure.
>
>If the VCO stops oscillating, for example, we might be looking at this as a
>DC problem. We think it probably isn't, becahse Zhangkun measured the DC
>voltage. Still, it would be nice to know.
>
>A scope and/or spectrum analyzer on the PLLs' outputs would help, comparing
>"work well" vs. "does not work" cases. If the VCO control line is
>accessable, that would be helpful to scope out too, though attaching
>anything there would have consequences.
>
>Even though we're pretty sure it is power related, some more data might help
>narrow it down further.
>
>Regards,
>Andy
>
>
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