.subckt comparator in+ in- out params: Vhigh=1 Vlow=0

* Behavioral voltage source 
E1 out 0 Value = {if(V(in+, in-) > 0, Vhigh, Vlow)}

* Input resistance
Rin+ in+ 0 10Meg
Rin- in- 0 10Meg

.ends comparator