[SI-LIST] Re: GND reference difference in modular system
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 21 Aug 2012 09:12:02 -0700
This sounds like LCR resonance. Improve your bonding between the rest of
the PCB structure and the chassis to drive the resonant frequency up.
Alternatively, insert dissipative materials to damp the resonance(s).
Steve
On 8/20/2012 9:56 PM, Sam Pete wrote:
> Hi Gurus,We have a modular system where the AC-DC PSU is pluggable to main
> board.The main board have 24 optical modules, whose cage is grounded to
> chassis, hence the digital GND plane of the main PCB is getting connected to
> chassis GND thru SFP Cages.
> We are seeing some difference in the GND reference when main board is inside
> the chassis and main board is on-bench(outside chassis)
> Appreciate if you share some knowledge on how to avoid this/solve this.
> ThanksSam
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