[time-nuts] Sine to LVDS

Javier Herrero jherrero at hvsistemas.es
Fri Sep 9 07:29:45 EDT 2011

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,


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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