Max Robinson wrote:
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.
Why?
A D flipflop works well as a mixer when either the D input frequency is
higher than the clock frequency or vice versa.
A shift register makes a better mixer in that the probability of a
metastable state occurring at the shift register output is much smaller
than when a single flipflop (from the same logic family) is used.
For example clocking a 74HC164 at 5.000055MHz whilst driving its serial
data input at 5MHz produces a 55Hz beat note output albeit with jitter
of several 5.00055MHz clock periods.
Bruce
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