根据以下NMOS晶体管模型代码，如果衬底接地，源极电压VS=2V，由于受背栅效应影响，可以计算得到阈值电压约为.MODEL n08 NMOS VTO = 0.70 KP = 110U GAMMA = 0.4 LAMBDA = 0.04+ PHI = 0.7 MJ = 0.5 MJSW = 0.38 CGBO = 700P CGSO = 220P CGDO = 220P+ CJ = 770U CJSW = 380P LD = 0.016U TOX = 14N