LVDS Transmitter Question

[suhas_shiv]

In a LVDS transmitter, whats the advantage/disadvantage of using all NMOS switches over 2 NMOS and 2 PMOS switches?

Thanks

 

[ericzhang]

Here are some ideas from me:
1. Same turn on resistance, nmos transistor size is smaller than pmos, which adds load of predriver.

2. Different turn on speed of pmos/nmos, difficult
for predriver timing. For the body effect, up/ down
nmos also behaves a little differently.

 

[husseinadel]

i think main issue is the speed ,,using all nmos enhances the speed