[SI-LIST] Re: What is the intention of this application of ferrite beads?
- From: "Wawoo, Nachiket" <Nachiket.Wawoo@xxxxxxxxxxxxxxxx>
- To: "carson.au@xxxxxxxxx" <carson.au@xxxxxxxxx>
- Date: Mon, 14 Apr 2014 05:08:22 +0000
Hello Carson,
470nF capacitor is used as decoupling purpose and bead is for isolation of GND.
Consider the case that ferrite bead is not placed. Now when 470nF cap will
decouple high frequency noise, it will be spread in to GND of circuit which may
further affect GND of ADC due to common GND.
Now if we place the bead then decoupled noise will be prevented to reach to ADC
GND.
Hope this helps.
Best Regards / Mit freundlichen Grüßen,
Nachiket Wawoo
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Carson Au
Sent: Monday, April 14, 2014 10:13 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] What is the intention of this application of ferrite beads?
Hi,
My first post on the reflector! :)
I was looking through some documentation for the Xilinx FPGAs and came across
this schematic diagram (page 72 - UG480 -
http://www.xilinx.com/support/documentation/user_guides/ug480_7Series_XADC.pdf
)
This is meant to be a circuit to filter or prevent high frequency noise from
coupling onto the inbuilt ADC of the FPGA.
I do not quite understand the intention of Xilinx to recommend the ferrite bead
on the low-side. Xilinx says it is to provide high frequency isolation.
However, as I see it, the 470nF capacitor as shown will provide an AC path for
the high frequency noise of the ground to couple into VCCADC anyway??
Regards,
Carson Au
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