Some OCXO schematics: http://leapsecond.com/museum/10544/ http://leapsecond.com/museum/10811a/
/tvb (i5s) > On Sep 5, 2014, at 5:50 AM, Dan Kemppainen <d...@irtelemetrics.com> wrote: > > Hi Bob, > > Being relatively new to this 'high end' time stuff, there's lots to > learn... So, how much bandwidth might a typical OCXO have on the EFC > pin? My assumption is that it is very low, but I have nothing to back > that up. > > If I had 10Mhz or some other high frequency on the EFC line, would a > typical OCXO respond to that? > > The concern is that any HF noise on the power pins of the driving op-amp > might make it onto the EFC line. Of course most amps have good PSRR at > low frequencies. If the EFC pin only has low frequency response, there > shouldn't be an issue. > > Are there any OCXO schematics out on the web, that one could study? > > Dan > > > > >> On 9/5/2014 7:02 AM, time-nuts-requ...@febo.com wrote: >> Hi >> >> The EFC pin *might* have a bypass cap on it. If you drive it with an op-amp >> an isolating resistor might be needed. If so, a couple hundred ohms is >> likely enough to stabilize the op-amp. >> >> In a closed loop / control loop setting, the noise on the EFC will be >> whatever the loop generates. As long as you stay with good quality op-amps >> and low impedances in your filters, things should be plenty quiet. >> >> Things like EFC range, output frequency, phase noise, and intended use / >> circuit would be needed to come up with more specific information. >> >> Bob > _______________________________________________ > 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.
