I'd like to design a differential input XOR circuit using the FOLDED gilbert cell
for phase detector, how to get starting to design the circuit? input signal is LVPECL
Vcm=2v, swing Vpp=800mv. 3.3v rail.
anyone with experience of this kind of ckt can tell me how to design this one like
(1) Bias current distribution
(2) input common mode can be the same level?