[time-nuts] Build my own dist. amp ??

BriMDavis at aol.com BriMDavis at aol.com
Wed Dec 17 05:15:25 UTC 2008


Bruce Griffiths wrote:
 
>
>Very few OCXOs and other frequency standards have outputs 
>lower than +4dBm. Most have outputs in the +7dBm to +15dBm range.
>
And what happens to that +7 dBm source if you split it 8 ways and
add some padding for additional matching and isolation, plus some
input transformer and/or filter losses?
 
 Or what if the reference being distributed comes off a multiplier
chain or VCO at a lower output level?
 
 Is there room in your world view for a simple, low cost design
that doesn't reach the ultimate noise floor, but covers a wide 
range of input frequencies with decent noise floor performance?
 
>
>Using an unnecessarily  wide band device in a frequency distribution
>system isn't usually a particularly good idea.
>
It isn't "unecessary" when the circuit needs to operate over 
that wide of an input frequency range in its' intended range
of applications.
 
>
>The only way to find out what the close in phase noise characteristics
>are is to construct an amplifier using such a device and measure it.
>
Some data sheets contain this information at spot frequencies; 
this one does not.
 
 Unfortunately, I do not have access to a phase noise test system
at this point in time, hence my question to the list.
 

Brian
 
p.s.
 
 I deleted most of my original reply before posting this.
 
 Your posts contain many condescending remarks insinuating
misuse of the part, and how easy it is to do it properly,
yet you refuse to answer a simple question, to wit: 

Can you point to something, IC or discrete, that will 
cover sources in the 10-200 MHz range with similar or
better reverse isolation at comparable size and cost ?




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