stripline@ 75 Ohm
 

Hi OM's

I want to build an distribution amplifier for video using a MAX 4137.
Maxim advises to use stripline for the in- and output.
Can someone tell me what dimensions I should use for the stripline?
(@ 75 Ohm, 350 MHz max, standard fibreglass pcb)

Thanks in advance.

73, Wim Smeets
PE1PME

stripline@ 75 Ohm
 

wrote in message
ll.nl...
I want to build an distribution amplifier for video using a MAX 4137.
Maxim advises to use stripline for the in- and output.
Can someone tell me what dimensions I should use for the stripline?
(@ 75 Ohm, 350 MHz max, standard fibreglass pcb)

Only if you tell us your board stackup dimensions.

Various freeware programs such as TxLine
(http://www.taconic-add.com/en--downloads.php) can compute these dimensions
for you quite easily.


Thanks in advance.

73, Wim Smeets
PE1PME

stripline@ 75 Ohm
 

1.2mm on G10 , 1,6mm thick glass epoxi board will give you a Z0 of 75
ohms from DC to daylight.
Saandy 4Z5KS

stripline@ 75 Ohm
 

Thanks a lot Saandy

Wim pe1pme

stripline@ 75 Ohm
 

Not so, Saandy. He said STRIPLINE, not microstrip. Now he may not know the
difference, but that is an incorrect value for stripline.

WHich is it, microstrip (open face) or stripline (sandwich)?

Jim



"Saandy , 4Z5KS" wrote in message
ups.com...
1.2mm on G10 , 1,6mm thick glass epoxi board will give you a Z0 of 75
ohms from DC to daylight.
Saandy 4Z5KS

stripline@ 75 Ohm
 

what's the difference?
Is "open face"on a singlesided pcb and "sandwich" on a doublesided pcb?
I use a doublesided pcb with one side as a groundplane.

tnx, Wim

stripline@ 75 Ohm
 

forgive him, not me would you care to hang a mosquito on a piece of
strip line. It's quite clear he's referring to a microstrip circuit.
which one of us is using strip lines, except in power amplifiers.

stripline@ 75 Ohm
 

i can send you a small gem of a program, very fit for amateur use. if
your interested, write me at the email directly.
Saandy 4Z5KS

stripline@ 75 Ohm
 

"Saandy , 4Z5KS" wrote in message
ups.com...
i can send you a small gem of a program, very fit for amateur use. if
your interested, write me at the email directly.
Saandy 4Z5KS

Or download "AppCad" free from Hewlett Packard. It does both microstrip and
stripline and as they say on Madison Avenue, "So much more".

W4ZCB

stripline@ 75 Ohm
 

You wanna try that again in English?

Jim


"Saandy , 4Z5KS" wrote in message
oups.com...
forgive him, not me would you care to hang a mosquito on a piece of
strip line. It's quite clear he's referring to a microstrip circuit.
which one of us is using strip lines, except in power amplifiers.

stripline@ 75 Ohm
 

No. Microstrip is the transmission line on one side of a double-sided PCB
and the ground plane on the other side. Stripline is with TWO PCBs with the
transmission line sandwiched on one of the boards and ground planes on BOTH
the outside layers. It makes for a much improved shielding at the expense
of much more complex mechanical assembly.

Jim



wrote in message
ll.nl...
what's the difference?
Is "open face"on a singlesided pcb and "sandwich" on a doublesided pcb?
I use a doublesided pcb with one side as a groundplane.

tnx, Wim

stripline@ 75 Ohm
 

Oh, well, those of us who deal with multilayer boards regularly use
stripline: lines sandwiched between ground planes on inner layers. But
from the sounds of it, Wim almost certainly is using microstrip.
However, if you look more carefully at it, you'll discover that your 75
ohm line is NOT 75 ohms "from DC to daylight" -- things fall apart at
low frequencies (significantly so below 1MHz or so), and where the
dimensions of the line are comparable to a wavelength (well below
"daylight"). But again, Wim should be fine using the dimensions you
originally gave him for what he wants to do.

Cheers,
Tom

stripline@ 75 Ohm
 

wrote:
what's the difference?

You should do some homework,
http://www.ansys.com/industries/mems..._micostrip.pdf

or in a shorter format

http://tinyurl.com/dxtvu

Cheers,
Galen, W8LNA

stripline@ 75 Ohm
 

It's a long and twisty path...

When Hewlett-Packard split off the test and measurement, life sciences,
medical and semiconductor businesses in 2000 as Agilent Technologies,
AppCAD went to Agilent. But last year, Agilent split off the
Semiconductor Products Group, which is now a new company, Avago
Technologies. Because AppCAD supports design of circuits using the
semiconductors, it went to the new company. If you go to
http://www.avagotech.com/ and search for appcad, you will pretty much
immediately find a link to the Avago-supported version. (You can also
get there by searching for appcad on the Agilent home page, but it will
redirect you to Avago.)

Cheers,
Tom


Cheers,
Tom

stripline@ 75 Ohm
 

Thank you all for your input and help!
Now i can live on :)

73, Wim PE1PME