[time-nuts] minimalist sine to square

jimlux jimlux at earthlink.net
Fri Jan 19 16:36:57 EST 2018


On 1/19/18 12:54 PM, Poul-Henning Kamp wrote:
> --------
> In message <898171c2-0e9a-6a2a-dcfc-b7d893f8942f at earthlink.net>, jimlux writes:
> 
>> What about the plethora of LVDS receivers - they're basically a
>> differential input thresholder, with deliberate hysteresis, looking for
>> a 300 mV shift across a 100 ohm resistor.
> 
> I played with that, I used a small transformer to balance the signal
> and then into LVDS receiver through a voltage divider.  Worked well,
> but I didn't measure the jitter, it was just for a micro-controller.
> 

You can also do it with capacitive dc block to one side, and some 
resistors - the ap notes describe it.  The receivers are a fairly high Z 
input, so you pick the voltage divider resistors to make the termination 
resistance right for the incoming signal.



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