Hi This gets into the “other side” of the whole comparator / squaring circuit test process. What matters for ADEV and what matters for phase noise at 100KHz offset likely are not the same thing. A lot of circuits do quite well inside 100 Hz, but not so well above that offset.
Driving a 5V powered CMOS gate with 5.5V p-p does a pretty good job …. Bob > On Oct 3, 2017, at 10:11 PM, Mark Sims <hol...@hotmail.com> wrote: > > I am using the simplest possible sine to square wave converter on my HP5313xA > counter time interval calibrator... a capacitively coupled HCMOS gate > (74HC86) biased at VCC/2 with two 47K resistors as shown in the LPRO manual > and Wenzel's squarer page. I was not expecting anything good, but was > pleasantly surprised. Attached is a plot of the xDEVS using a TAPR TICC... > TICC clock was a 5071A 10 MHz, chA input was the squared output of the > second 5071A output 10 MHz signal divided to 1PPS with a TADD2-mini. The > squarer prototype was built on perf board using a DIP packaged part. > > An update on the calibrator project: I have the PCBs on order and they have > supposedly been shipped, but are taking their sweet time getting here from > China (despite paying for DHL 3 day shipping). But, it looks like I need to > tweak the PCB since the rotary switches that I received do not match the > samples that I got... grrr... I have found a local guy that may be able to > assemble the boards for a quite reasonable price and another place for a > semi-resonable price. > > The same PCB order also included the boards for the X72 rubidium > interface.<cal.gif>_______________________________________________ > 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.
