Hi Did you do any temperature stabilization on the op amps?
Bob On Apr 17, 2012, at 5:25 AM, Bruce Griffiths 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 -- [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.
