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LVPECL driver misunderstanding

Hello there,

I try to figure out for a few days now how a LVPECL works. It is said that you should terminate with a Vcc-2V which means in the case of 3.3 V , 1.3V.

I don't understand from this how can we achieve at the receiver side a Vdiff of 800mV and V common mode of 2V (so swing between 2.4 and 1.6V). I tried every possible termination with thevenin, T or PI network resistor, it never game me this. 

The only way I could achieve this is to assume a voltage drop in the emitter.

Any information about this to enlighten me would be amazing !

Thanks



forgot the "how"
[edited by: Rleduc at 5:47 PM (GMT -4) on 20 Oct 2021]