RF amplifier for Ti:S laser clock

[Michael Giacomelli]

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Could anyone recommend me a small amplifier to take the 80 MHz clock from
our Ti:S and amplify it 25 dB for our 50 ohm digitizer?  We have been using
the Minicircuits ZFL series, but reliability seems poor.  We keep having to
replace them, and after discussions with their tech support, we haven't
found anything wrong on our end (voltages, signal levels, etc are all
within spec).

Mike

[Mark Cannell-2]

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Hi Mike

If you have electronics support you could look at using a high speed op amp such as an AD8000. An alternative, if you don't need linear amplification, might be a high speed comparator?

HTH

Mark B. Cannell. Ph.D. FRSNZ FISHR
Department of Physiology, Pharmacology & Neuroscience
School of Medical Sciences
University Walk
Bristol BS8 1TD
 
[hidden email]
 
 

On 2/02/18, 12:58 AM, "Confocal Microscopy List on behalf of Michael Giacomelli" <[hidden email] on behalf of [hidden email]> wrote:

    *****
    To join, leave or search the confocal microscopy listserv, go to:
    http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
    Post images on http://www.imgur.com and include the link in your posting.
    *****
   
    Could anyone recommend me a small amplifier to take the 80 MHz clock from
    our Ti:S and amplify it 25 dB for our 50 ohm digitizer?  We have been using
    the Minicircuits ZFL series, but reliability seems poor.  We keep having to
    replace them, and after discussions with their tech support, we haven't
    found anything wrong on our end (voltages, signal levels, etc are all
    within spec).
   
    Mike
   

[Hongtao Chen]

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We are using amplifiers from ISS. You can check with them.
For 80MHz clock, we are using these ISS amplifiers and CFD 6915 for many
years and no issues so far.

On Thu, Feb 1, 2018 at 4:57 PM, Michael Giacomelli <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Could anyone recommend me a small amplifier to take the 80 MHz clock from
> our Ti:S and amplify it 25 dB for our 50 ohm digitizer?  We have been using
> the Minicircuits ZFL series, but reliability seems poor.  We keep having to
> replace them, and after discussions with their tech support, we haven't
> found anything wrong on our end (voltages, signal levels, etc are all
> within spec).
>
> Mike
>

--
Best Regards,
Hongtao Chen

[Zdenek Svindrych-2]

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Hi Mike,
I have used both cheap (Mini Circuits, wideband amplifiers from eBay) and
not-so-cheap (ISS, Becker & Hick, RFHIC) and they all worked OK.

Just remember that some photodiode bias circuits depend upon the load (the
amplifier) to provide a low-impedance DC path to ground, while many off-the-
shelf amplifiers are AC-coupled!

Best, zdenek
--
Zdenek Svindrych, Ph.D.
Research Associate - Imaging Specialist
Department of Biochemistry and Cell Biology
Geisel School of Medicine at Dartmouth


---------- Původní e-mail ----------
Od: Michael Giacomelli <[hidden email]>
Komu: [hidden email]
Datum: 1. 2. 2018 19:58:06
Předmět: RF amplifier for Ti:S laser clock
"*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

Could anyone recommend me a small amplifier to take the 80 MHz clock from
our Ti:S and amplify it 25 dB for our 50 ohm digitizer? We have been using
the Minicircuits ZFL series, but reliability seems poor. We keep having to
replace them, and after discussions with their tech support, we haven't
found anything wrong on our end (voltages, signal levels, etc are all
within spec).

Mike
"

[Michael Giacomelli]

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Thanks Zdenek,

We had been using a 50 ohm attenuator to provide a path to ground for DC,
but measuring it without the attenuator, there was a lot of DC voltage.  It
is possible the attenuator wasn't providing a low enough path to ground and
was passing some DC voltage which was damaging the amps.  I've added a bias
T with a resistor on the DC port.  I'll see if this works better.

Mike

On Mon, Feb 5, 2018 at 10:01 PM, <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Hi Mike,
> I have used both cheap (Mini Circuits, wideband amplifiers from eBay) and
> not-so-cheap (ISS, Becker & Hick, RFHIC) and they all worked OK.
>
> Just remember that some photodiode bias circuits depend upon the load (the
> amplifier) to provide a low-impedance DC path to ground, while many
> off-the-
> shelf amplifiers are AC-coupled!
>
> Best, zdenek
> --
> Zdenek Svindrych, Ph.D.
> Research Associate - Imaging Specialist
> Department of Biochemistry and Cell Biology
> Geisel School of Medicine at Dartmouth
>
>
> ---------- Původní e-mail ----------
> Od: Michael Giacomelli <[hidden email]>
> Komu: [hidden email]
> Datum: 1. 2. 2018 19:58:06
> Předmět: RF amplifier for Ti:S laser clock
> "*****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Could anyone recommend me a small amplifier to take the 80 MHz clock from
> our Ti:S and amplify it 25 dB for our 50 ohm digitizer? We have been using
> the Minicircuits ZFL series, but reliability seems poor. We keep having to
> replace them, and after discussions with their tech support, we haven't
> found anything wrong on our end (voltages, signal levels, etc are all
> within spec).
>
> Mike
> "
>