Thanks for the spec. I suspected that it would be in that ball park. The discrete transistor type amplifiers achieve around 120dB or more at 10MHz. But, they are a lot more effort to implement than the opamp designs.
I believe the transformer in this case is for ground loop isolation rather than S12 isolation. On 21 November 2013 20:20, Charles Steinmetz <csteinm...@yandex.com> wrote: > Corby wrote: > > This opamp buffer has 80-90db isolation. >> > > That is typical at 5 to 10 MHz *if* (i) all of the splitting is done on > the input side (i.e., each output has its own op amp), and (ii) the > splitter and all of the construction (grounds, shielding, etc.) is done > correctly. > > If any splitting is done on the output side of the op amp(s), by using one > op amp to drive more than one output through separate back terminating > resistors, the outputs that share an op amp will only be isolated by 30 to > maybe 40 dB (again, assuming that the op amp has been well chosen and all > of the construction is done correctly). > > Best regards, > > Charles > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.