If you use a D flip flop as a mixer it will produce the difference only.
You have to get the D and clock signals right I forget which one has to be
the highest frequency to make that work.
Regards.
Max. K 4 O D S.
Email: m...@maxsmusicplace.com
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----- Original Message -----
From: "ed breya" <e...@telight.com>
To: <time-nuts@febo.com>
Sent: Tuesday, August 09, 2011 4:05 PM
Subject: [time-nuts] FTS 1050A
If you just want to get it to an integer value, I recommend, for example,
that you find or make a 6.0000000 MHz VCXO using a common 6 MHz crystal,
and mix it with the 6.000300 MHz using a 74HC86 XOR, then the 300 Hz IF
can easily be low-pass filtered out and used as the feedback to a PLL
(like 74HC4046A) which drives the VCXO. The other input to the PLL can be
made by dividing the VCXO output by 20,000 (with 74HC390s), resulting in
300 Hz as a reference. The net result is that the ovenized oddball
reference will phase lock the common-frequency VCXO - but only close-in
since the sample frequency is only 300 Hz - farther out phase noise will
depend on how clean you make the VCXO. Once you get 6.000000 MHz, you can
make whatever you want. With a little more complexity there are lots of
combinations that could make a nice integer value (like 10.000000 MHz),
and at a higher sample frequency - you just have to figure out what you
can add, subtract, multiply and divide with convenient values to get
something usable.
Ed
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