[time-nuts] Distribution amplifier for 10MHz and 1 pps

[Tobias Pluess]

Hi,

if it is of interest for someone:
I have made my own distribution amplifier for this exact purpose. Since I want sine waves, not square, I used some OpAmps. Hamilton Technical Services has published a design for a distributor here

http://www.stable32.com/An%20Octal%2010%20MHz%20Distribution%20Amplifier.pdf

and I have designed my own one which is quite similar.

Schematic of one channel:
https://hb9fsx.ch/wordpress/wp-content/uploads/2018/11/ad9631-10MHz-driver.png

Frequency response, input matching and reverse isolation:
https://hb9fsx.ch/wordpress/wp-content/uploads/2018/11/distrib-amp-bode2.png

Distortion:
https://hb9fsx.ch/wordpress/wp-content/uploads/2018/11/distrib-amp-fft.png


Since it uses OpAmps it is quite easy to design one stage for a particular desired input impedance. So one of the channels has 200 Ohms input impedance, and which results in 50 Ohms if 4 channels are paralleled - and thus the input and output impedances stay at 50 Ohms. So there is no need for a real "splitter".

So far I was not able to measure the residual phase noise of this distributor because I am still lacking a proper phase noise test set. (but it becomes better. I am currently making one. Hopefully I will finish someday :-)).


Tobias
HB9FSX


________________________________________
From: time-nuts [time-nuts-bounces at lists.febo.com] on behalf of Perry Sandeen via time-nuts [time-nuts at lists.febo.com]
Sent: Wednesday, March 20, 2019 23:50
To: time-nuts at lists.febo.com
Cc: Perry Sandeen
Subject: Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps

Yo Bubba Dudes!
Wrote:
Gosh. This topic comes up at least once every 6 months. Adiligent search of the time-nuts database would turn up amazing things. . .
Yep, it does and it always will for at least two reasons.
One, we have new people joining the list.  Which is great. They're at the beginning of a learning curve and most aren't in the upper echelons of TN knowledge.  It's a hobby for them not an extension of their professional lives.  But they want to learn and make progress

New members aren't aware of the past data base of info, and speaking for myself I never found an easy way to search.  If there is an easy way to do so I'm willing to be taught.
I learn a lot from the posters even if it is far above my technical skills.  If I have no understanding or interest of post(s), I just delete it and keep what interests or is helpful to me.
That's as it should be, and hopefully always will be, on a list like this with such a diverse mix of members.
Now we all started spending 9 months in a nice warm water bath happily sucking our thumb.
Then some dude takes us out, turns us upside down, and slaps us on our butt while saying *Welcome to the world*!
Now what we think is: Say what sucker! I was perfectly happy where I was and minding by own business.
However, like it or not, we are then at the start of the unending learning curve until our lights goes out figuratively or literally.
Regards,
Perrier








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