[SI-LIST] Re: Bit Error Caused by NOISE
- From: "Ingraham, Andrew" <Andrew.Ingraham@xxxxxxxxxx>
- To: <xlh9504@xxxxxxxxx>
- Date: Wed, 21 Nov 2001 08:25:01 -0500
> The noises of VCC(3.3V) and GND(0V) are both
> 500mVp-p!
What does this mean??
It implies that you are observing VCC and GND with respect to something
else. Chassis? Another GND?
I think what matters to the ATC is the noise on VCC relative to its
local GND. Think Relativity. If GND bounces, and VCC bounces along
with it, (Vcc-GND) may have 0V AC component and the ATC doesn't see any
noise.
Look at your signals relative to the ATC's GND. That's all that
matters.
Depending on the noise, LC filters can clean up a lot without
introducing much DC voltage drop. Ferrite beads can help when an AC
loss component is needed but DC resistance is undesirable.
Regards,
Andy
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