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mole42uk · 23rd May 2021, 8:37 am

Hi,

I am breadboarding my latest GPSDO using a ublox NEO-7 GPS receiver. I have a very stable phase lock using a 100MHz output from the receiver and a divided 10MHz OCXO clock.

I have used the attached circuit to ptovide a 50Ω output, and I'm experimenting with the square-to-sine converter also shown. What I don't know how to calculate is the output impedance which I would like to be 50Ω.

Would anyone help please?

23rd May 2021, 8:37 am	#1
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	1MHz output impedance query? Hi, I am breadboarding my latest GPSDO using a ublox NEO-7 GPS receiver. I have a very stable phase lock using a 100MHz output from the receiver and a divided 10MHz OCXO clock. I have used the attached circuit to ptovide a 50Ω output, and I'm experimenting with the square-to-sine converter also shown. What I don't know how to calculate is the output impedance which I would like to be 50Ω. Would anyone help please? Attached Thumbnails __________________ Richard Index: recursive loop: see recursive loop