[time-nuts] DMTD downmixer question

St├ęphane Rey steph.rey at wanadoo.fr
Fri Jul 1 04:45:25 EDT 2016


Hi there,

I will receive my SR620 soon and want of course to use it as well for 
stability measurement using the DMTD method.

I've read many things on how to design the downmixer. There will be a 
DDS or low noise generator as LO, the two mixers, and the squarer. There 
are apparently many ways to do the squarer. Some of the ways I've seen 
are using fast comparator, logic gate, fast amplifiers...
Finally is there a way which looks better than the others ? I was 
hesitating between a fast comparator and an ECL logic gate for instance.

Thanks & cheers
Stephane



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