I've used some LT1719s in a project to discipline a 100MHz OCXO using an
HMC1031. They work really well in squaring up the 10MHz sine from my Rb
reference.
Neil G4DBN
On 08/09/2017 23:15, Charles Steinmetz wrote:
Chris wrote:
Mark Sims wrote:
It takes a 10 MHz input, feeds it through a sine-to square converter
(using a biased CMOS gate)
Could you send me a snip of what that looks like?
Depending on your application and its tolerance for jitter/PN, you may
want to use a fast analog comparator to do the initial sine-square
conversion. The difference in jitter/PN compared to a biased CMOS
gate can be 10-20dB over a wide range of tau/BW (even worse if the
gate has a Schmidt trigger input, which has WAY, WAY too much
hysteresis for a sine-square converter). I recommend the TLV3501,
LT1719, and LT1720 out of extensive experience with them. These
comparators have just the right amount of internal hysteresis for
squaring a 10MHz sine wave, with 10MHz jitter around 10-15pSrms for
jitter bandwidths from 10Hz-5MHz.
Of course, if your multiplier/divider chain has more jitter than a
CMOS squarer, it won't make much difference which squarer you use --
so be careful with its design and construction.
Best regards,
Charles
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