An alternative is to use a Norton style amp (or other low noise high linearity amp without stellar reverse isolation) to boost the signal level and drive a set of high isolation output stages. A relatively simple discrete current feedback amp may suffice. For higher reverse isolation a cascode arrangement may suffice. Alternatively the input amp could drive a passive splitter each output of which drives a high reverse isolation stage. Even a series shunt feedback stage with a low noise bias circuit can have low PN. Just avoid the design error in the HP3048 option K22 where the bias circuit is more susceptible to power supply noise than it needs to be.
Bruce On Tuesday, November 25, 2014 11:45:47 PM Dr. David Kirkby wrote: > On 25 Nov 2014 23:10, "Bob Camp" <[email protected]> wrote: > > Hi > > > > For a modern build, the PZT3904’s and PZT2222’s are a pretty good way to > > go with this amp. > > > For normal distribution to instruments, there’s really no need to do > > anything this complex. > > > Bob > > I am also thinking about the construction of a distribution amplifier with > 15 or so outputs. One thing that came to my mind, is that there may be > some point in having one or two outputs where more money is spent. Then if > one thinks an item might be particularly sensitive to some aspect of the > reference, one can use that. > > One could for example have one or two outputs which have harmonics > suppressed 100 dB, without going to unnecessary expensive on all outputs. > > Dave > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the > instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
