FreeLists / si-list / [SI-LIST] Re: Running analog video on micro-coax

["Nagaraju Nerella" <nagaraju.nerella@xxxxxxxxxxxx>]

Here I have one doubt if suppose the impedance viewed to input side
after the 25-ohm resistor will be 100ohms how it will match with 50 ohms
impedance.
75ohms analog signal--------> Buffer amplifier----->25 ohms
resistor--->50 ohms cable.
If my question is not sounds good, please forgive me.
I feel instead of that impedance transformer network is better based on
the analog signal operation frequency.
Thanks & Regards,
Nagaraju


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Tom Dagostino
Sent: Friday, June 02, 2006 4:56 AM
To: joel@xxxxxxxxxx; SI-List
Subject: [SI-LIST] Re: Running analog video on micro-coax

Joel

You could try a simple impedance matching network.  The simplest would
be a
25 Ohm resister in series between your 75 Ohm driver and the 50 Ohm
cable.
You also might look at what Mini Circuits or other vendors have that
will
meet your requirements in surface mount networks.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@xxxxxxxxxxxxx
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Joel Brown
Sent: Thursday, June 01, 2006 2:13 PM
To: SI-List
Subject: [SI-LIST] Running analog video on micro-coax


We have an application which requires running 75 ohm analog video over
coax for a distance of 75 Inches.
Conventional VGA cables are much to large and bulky because we need to
run the cable through hinges and cable retractors.
I have seen some micro-coax products from several companies which use
very small diameter cable.
However all of the micro coax products are 50 ohm and seem to be
targeted for digital signals such as LVDS.
One approach I am considering is to use a buffer amplifier to receive
the 75 ohm signal and then redrive it on the 50 Ohm cable.
The only drawback is possible signal distortion from the buffer
amplifier. The signal bandwidth is 100 MHz.
Any thoughts or ideas would be appreciated.
Thanks - Joel



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