[time-nuts] HP-531xx calibrator nearing completion
neil at g4dbn.uk
Fri Sep 8 18:56:17 EDT 2017
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
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.
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