Bob wrote:
An AD 797, a couple of metal film resistors, and a fairly large (say 47 uf) plastic cap work pretty well.
The band from 10 Hz down to 0.1 or 0.01 Hz is generally important when testing oscillators. To keep the 797 input noise density below a few nV per root Hz, the terminations must have very low resistance. With such low resistance, a 47 uF cap won't even get you to 10 Hz, much less 0.1 or 0.01 Hz.
One more thought: Many oscillators have internal regulators that are not nearly as good as what you can build. No sense using an external supply with 5 nV per root Hz noise density if it will be re-regulated inside the oscillator by a circuit that has a noise density of 250 nV per root Hz.
Best regards, Charles _______________________________________________ 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.
