Re: TTL signal

John Larkin wrote:
On Thu, 18 Dec 2008 09:05:19 -0500, Phil Hobbs
<pcdhSpamMeSenseless@xxxxxxxxxxxxxxxxxx> wrote:

John Larkin wrote:
On Tue, 09 Dec 2008 14:15:11 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Tue, 9 Dec 2008 12:20:59 -0800 (PST), jamie_kriebel@xxxxxxxxx
wrote:

On Dec 9, 3:14 pm, Phil Hobbs <pcdhSpamMeSensel...@xxxxxxxxxxxxxxxxxx>
wrote:
jamie_krie...@xxxxxxxxx wrote:
I'm trying to convert an analog signal, 150mV, 3-5nS pulse width to a
TTL signal.
What sort of TTL are you going to use with a 3 ns pulse????

Cheers,

Phil Hobbs
I'm looking to use the TTL as a trigger pulse for an NI scope
application. So the pulse can be stretched longer than the 3nS pulse.
The 3-5nS pulse is coming from a photodiode circuit on a Cobolt Tango
Laser.
I assume the scope has an analog trigger input, with programmable
trigger level. So maybe all you need is a linear amplifier.

Like this, maybe:

http://www.minicircuits.com/pdfs/ZX60-6013E+.pdf

This is likly a single MMIC in a can, so probably inverts the signal.


If the scope really needs TTL, of course we could sell you one of
these...

http://www.highlandtechnology.com/DSS/T860DS.html


John


Hey, it works!

ftp://66.117.156.8/3ns_TTL.jpg

That's a 3 ns, 100 mV input and 4 volts out. It even works with an 80
mV, 1 ns input, still 4 volts out. I'm sort of impressed!

John

I just built one of those amps into a 6 GHz microwave setup yesterday. 16 dB gain at 1 GHz, 12 dB at 6 GHz, $50 with nice gold-plated SMA connectors. Not bad.

BTW John, could you set up your FTP server to accept PASV? I have to download those pictures using command-line FTP and look at them in a photo editor, because Mozilla browsers always want to use passive-mode FTP.

Cheers,

Phil Hobbs

Hi, Phil,

I asked my ISP guys to enable PASV, and they replied that PASV is the
responsibility of the client, not the server, and they demonstrated
that they could access my site in PASV mode. They say...

"PASV or passive mode is a setting in the ftp client not on the
server. Some web browser's ftp clients are severely broken -cough-
Internet Exploder -cough. They might need to use a stand alone ftp
client."


Hey, I tried.

John

John,

Thanks. My FTP server has settings to enable/disable both active and passive FTP. If it's switched on at their end, it's probably a firewall issue.

Cheers,

Phil Hobbs
.

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