MOS Transistors

NMOS Transistor
CMOS





P-N Junction：
forward bias: p->n
reverse bias : n->p

for NMOS: Vsb > 0 RBB, Vth increase
for PMOS:  Vsb > 0 FBB,

Left Graph shows the Current equations at drain of a NMOS in different regions: subthreshold region, linear region, saturation region and velocity-saturation.

1) r_d in the equation of I_D in the subthreshold region is the DIBL factor and also the body effect.

2) K' = u*C_ox

3) (1+lamda*V_ds) is channel modulation