I had similar need some time ago and
I found that a differential pair with two (pnp) BFR93
worked much better than any comparator(three or four tested, but not the
adcmp604).
(was a pll reference and I judged the impact of such
observing the phase noise at microwaves).
lc.
ct1dmk.
On 9/9/2011 12:29 PM, Javier Herrero wrote:
Thanks for the reminder :)
Te available 180MHz signal has that level, and it is quite heavily
bandpass filtered, since it comes from a multiplier chain from an 45MHz
OCXO, so the ADCMP604 will fit nicely
Best regards,
Javier
El 09/09/2011 13:07, Bruce Griffiths escribió:
Javier Herrero wrote:
Hello all,
I think that the same question that has been discuted here a zillion
times but usually around 10MHz... anyway, what would be the best way
to convert a sine wave to a LVDS clock (preferably duty cycle 50%) at
180MHz?
Texas Instruments suggest a LVDS receiver as a comparator
http://www.ti.com/lit/an/slyt180/slyt180.pdf but time ago this was
discussed here, and not very favoured due to the high hysteresis of
the LVDS receivers.
Regards,
Javier
Use a true LVDS comparator (e.g. ADCMP604).
With 1:1 transformer coupled input and a pair of inverse parallel
schottky diodes across the inputs together with series resistors
between the transformer secondary to the comparator inputs should
suffice for inputs of +16dBm or more.
With sufficient input from a low noise source a cycle to cycle jitter
of 1-2ps should be feasible.
Sub picosecond jitter is feasible if one cascades a series of low pass
filtered limiter stages.
Bruce
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