Very good. I'm fascinated by the figures... how can such phase noise levels be measured and, in general, being able to "sense" the most faint signal.
On Tue, Apr 17, 2012 at 11:25 AM, Bruce Griffiths < bruce.griffi...@xtra.co.nz> wrote: > Subsequent measurements using an improved technique has allowed the true > flicker phase noise characteristics of a pair of OPA653 opamps to be > determined. > > Opamp > Gain 1x (6db folled by 6 db attenuator consisting of a 50 ohm resistor > in series with the output of the opamp and the 50 ohm load resistor) > Signal input level: + 10dBm > > OFFSET Opamp PN (dBc/Hz) Measurement system PN (dBc/Hz) > > 1 -148 -161 > > 10 -161 -172 > > 100 -164 -177 > > 1000 -164 -179 > > Source: 10MHz low phase noise OCXO removed from a Thunderbolt amplified by > a QBH9816 amplifier. > > Conclusion: FET opamp PN in the flicker region can be quite low despite > its somewhat higher baseband flicker noise than that of some bipolar input > opamps. > > Bruce > > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<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.
