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

[Joakim Langlet]

Hi,

I used a monolithic amp for 10MHz (and 20 MHz) in my design. Since it is 
driven directly from a digital signal it uses a low-pass filter at its 
input. I used a Mini-circuits splitter at the output. I have enclosed a 
part of the drawing.

In my case, I have two amplifiers (driven from two 180 degrees separated 
signals) and four outputs. The level at each output is high enough to 
use an external 1 by 4 splitter on the outside of the box. This gives me 
16 possible 10 MHz signal to instruments. I have never used this many of 
course.

Just as an example.

Regards,
Joakim Langlet (SM0OET)


Den 2019-03-16 kl. 19:01, skrev Taka Kamiya via time-nuts:
> Hello....
> I am thinking about distribution amplifier of a sort.  Not a kind with 8 or more output but just 2 or 3.
>
> As you know, most timing equipment comes with just one output of a kind.  Say one 10MHz and 1 PPS.  This is rather inconvenient. If I want to scope it without disturbing the setup, I cannot.  On my home brew Rb setup, I made sure I am going to put in 2 of each.
> 1 pps was easy.  Use 74HC04N.  Signal comes into a register and to one inverter.  Output of this inverter goes to all input of channel amplifiers.  Each channel consists of parallel inverters with output going to resisters, then tied together. Works well.  (amplifier meaning NOT gate)
>
> But how do I do this on 10MHz side?  I'd like to have minimal distortion (sine wave) and high isolation.  I acquired a few signal splitter and monolithic amplifiers.  Split first and amplify?  Amplify first and split?  Remember it's only 2 to 3 channels.  Amplifier module has too much gain, so I'll probably have to use attenuators.
>
> Have anyone run into this kind of thing?  Is there an existing design?  Anything anyone would like to share?
>
> ---------------------------------------
> (Mr.) Taka Kamiya
> I'm stuck in a wormhole....  Hello, worms!
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