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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