I am interesting about high speed multiplexers. Now I have a question about Rds_on.
When turn on the FET, there are Rds_on and parasitic capacitance on the signal trace. It will be a RC delay circuit.
There are a description from E2E --> We use a rough formula “Bandwidth = (3/2)xDataRate” which will provide sufficient margin. Does it have a limitation about PCB trace?
I have another question. There are three different Ron characteristics – Ron, Ron(p), ∆Ron. How this three characteristics affect our design?
In reply to Fan Wang51:
In reply to Ben Kuo:
How do you choose device base on the on state resistance spec in real case performance, I can’t prevent this issue even when I know how this trace long I have.
The only thing I can make sure is “longer trace you need lower on resistor”. Because it have to consider about capability of receiver.
Do we have a roughly equation can figure out what value of on resistance performance I need in my switch? What is the worst case Ron of a switch I can have in my system.
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In reply to Adam Torma:
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