Can get the gm by AC analysis& x' a4 A K4 V% s
, n4 B: R4 [/ Z: A6 s+ [* O' v; E: i
vin1 vi1 gnd xx ac 1/ r/ {) j7 \$ W$ ]; t
vin2 vi2 gnd yy3 x6 A1 T1 {+ h
.ac lin 1 1 2 ) R( ]- s# f$ S' X+ ]( A1 _ t - D/ v [' c( t5 O7 u& ^you can see the gm(at 1Hz fre) from 'output current Mag'