Hi Ed, I am a little confused with regard to your paragraphs 3 & 4. Could you elaborate on those two paragraphs ?
thank you, Bill....WB6BNQ ed breya wrote: > The simplest way to drop the output impedance without adding much > circuitry is to just change the series R to 100 ohms or so - that > would still give pretty good isolation from capacitive loading. > > If the R is dropped to zero, the DC performance will be best, but > you'll have to worry about the amount of capacitive loading. If the > lines are short - say a couple of meters or less of open wire, it > would probably be OK, but that much coaxial cable may make it oscillate. > > The suggestion to get the feedback right from the output terminal,or > even with external sensing at the load would be best for DC accuracy, > but would have the same problems as above. > > You can also take the DC feedback from the output directly, and the > AC feedback from the amplifier output, while the series resistor > isolates the two. This would give good DC accuracy and AC stability, > but would alter the dynamic response and LF noise shape somewhat. > > If you add an amplifier, you'll of course have to consider its offset > and noise contribution, and it will have the same stability issues to resolve. > > Ed > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
