From: Jon Keeble (firstname.lastname@example.org)
Date: Thu Jan 13 2000 - 13:25:00 PST
How 'bout daisy chaining the high speed signals (are there only 8 + the
clock?) through the connector?
This at least eliminates the stub and so maybe the cpci connectors could be
At the very least I'd suggest a modeling exercise is called for - AMP supply
spice models for their parts.
From: Bruce W. Marler <BMarler@WooshCom.com>
To: email@example.com <firstname.lastname@example.org>
Date: Friday, January 14, 2000 4:57 AM
Subject: [SI-LIST] : High Speed Backplane Connector Recommendations
>I am designing a high speed digital backplane interconnect system and was
>wondering if anyone had any recomendations about what manufacturer's
>connectors I should be looking at - either connector to connector systems
>card edge connector systems.
>Our system is a multidrop system with up to 18 cards plugging into a
>backplane. The bus is an 8 wide synchronous LVDS bus with a clock. Each
>data channel has a rate of 200Mbps, and the clock is 200 MHz. Density is
>not that great 60 to 80 signals within 3.5" of edge space.
>Each card will have only one load on it's stub from the main bakplane bus,
>and that load will be mainly capacitive due to the receiver. I am looking
>for connectors that will minimize the distance from the backplane to the
>receiver chip. Controlled impedance on the connector is not that important
>because I am keeping the length so short. But I do like it when connectors
>have a separate grounding bus connection like the AMP MICTOR or their
>I also like surface mount solutions like the AMP Mictor connector as it
>would enable me to route the backplane with minimal vias. However the AMP
>Mictor connector is extremely expensive and does not have different pin
>lengths for hot swapping.
>Does anyone have any recommendations on connnectors I should be evaluating?
>I have already looked at:
>AMP MICTOR - very nice small connector 0.4" from backplane to pin - very
>nice non-typical over-the-edge type connection for right angle connector -
>very expensive - this is my favourite so far, but it's price and lack of
>support for hot swapping are a problem.
>AMP Micro-Strip - a little larger than Mictor - 0.6 " - fairly
>expensive - nice but no support for hot swapping
>AMP 2mmHM - very long distance from backplane to pins - 1" for farthest
>pin - supports hot swapping - higher density than what I need.
>Teradyne's connectors - very similar to AMPs 2mmHM
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