Paul,
I haven't seen a reply by anyone so I will takle this with what I
know.
If you replacing coax cable (an impedence cable) then the
flex should
also be the same impedence, especially at that
frequency.
Now I spoke with a flex board house that said they
could do Multilayer flex
with controlled impedence. They were 1 of few. Ensure that it is
at least
a 3 layer (shield/ground, signal, shield/gound) also required to
controll the
impedence. The only problem I forsee is the connection
from the flex to
the board. ML flex will probabbly use offset
connections for each layer
so the point of connection will be of concern. May
want to work with
the board house to create off set layer
connections. A pain to connect
to the board but continues the
impedence.
From reading, there is a similar problem with the coax
connection to the
board
anyway.
Hope this
helps,
Hello all,
I have an application for a flex circuit that has
to run at 10 gig or above at a 1/4 watt. The circuit will be about 3
inches long. This will be used in place of coaxial cable. Is this
possible in a flex circuit and if so what design considerations must be
taken?
Thank you in advance,
Paul Gerlach
TRI-C Design
Inc.
1-507-663-1745