Hi Bruce, that would work too. We get <330fs jitter rms with this circuit using the Fairchild UHS LVC family, that's pretty much the noise floor of the OCXO :) If you use a bias network, you won't get 50% symmetry since it will never perfectly match the inverter's inflection point (which changes with temp etc), and you may insert noise from the power supply. With the feedback resistor it will operation at the inversion point without adding power supply noise. bye, Said In a message dated 7/30/2008 20:06:12 Pacific Daylight Time, [EMAIL PROTECTED] writes:
> Said Noise is lower if you use a pair of resistor to bias the inverter input at the threshold rather than the feedback resistor. A feedback circuit can be added to stabilise the output duty cycle. If you want subpicosecond jitter you need to use a different device/logic family. Bruce **************Get fantasy football with free live scoring. Sign up for FanHouse Fantasy Football today. (http://www.fanhouse.com/fantasyaffair?ncid=aolspr00050000000020) _______________________________________________ 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.
