Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <7FVr9.170534$S32.firstname.lastname@example.org> <7yWr9.170725$S32.email@example.com> <3DB086B8.3078@Spam.Bots> <_5gs9.178003$S32.firstname.lastname@example.org>
Subject: Re: Aylward, Engelhardt: Noise in a transient sim?
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Date: Sat, 19 Oct 2002 19:00:31 +0100
NNTP-Posting-Date: Sat, 19 Oct 2002 19:00:36 BST
"Mike" wrote in message
> "Mike Monett" wrote in message
> > Mike wrote:
> > [...]
> > > In real life, my actual results are within 10% of the theoretical
> > > and I'm assuming that power supply noise and digital switching
> > > zero. They aren't, of course, but even in high performance
> > > they aren't significant contributors (in my circuits).
> > >
> > > -- Mike --
> > Mike, how do you do that? Please tell us more. Crosstalk in high
> > pll's is extremely difficult to model.
> > Are you talking about measured results compared to simulations?
> > If so, given the non-ideal performance of bypass caps, the noise
> > bond wire inductance, the skin effect and prop delay of the ground
> > the problem of probing and measuring the results, how do you include
> > effects in your simulation?
> > If you have some magic layout tricks that overcome these problems,
> > us your secrets.
> You want _my_ secrets? In a thread a couple months ago, you wrote,
> to measuring less than 1uV in a 7GHz bandwidth, and things are
> get difficult." However good my performance is, you're doing far, far
Vn = 1uv/sqrt(7G) = 0.012 nv/sqrthz
Now... that I *don't* believe.
Are you sure you don't mean *at* 7GH with some other BW.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.