HD3SS3415: Insertion loss and coupling capacitors in cascade connection

tzabar texas instruments

Part Number: HD3SS3415
Other Parts Discussed in Thread: TMUXHS4412

I'm planning to connect in cascade two switches "HD3SS3415" for the PCIe Gen3 interface.

1. I have a concern about the total insertion loss of the PCIe lanes that pass through two switches. Is there a real issue?

2. Where should I install the coupling capacitors in this case? Is that okay to install them as shown in the attached figure above?

0 Brian Zhou over 3 years ago

you running pCIe gen3 or gen4?

Regards

brian

0 tzabar texas instruments over 3 years ago

PCIe Gen 3

0 Brian Zhou over 3 years ago in reply to tzabar texas instruments

for Gen3 , at 8Gbps (4 Ghz). single mux loss is 1.5db, so there are 3db loss for cascading Mux, a little too much.

try TMUXHS4412, only 0.5-0.6 db loss for single mux.

Regards

Brian

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