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1 2 3 ???? Ku=-gm(Rds//Rd) Ku=-gmRb(?±Rds>>Rd) Rt=Rg//Rgs=Rg RO=Rg Ku=-gm(Rds//Rd) Ku=-gmRd(?±Rds>>Rd) Rt=Rg+R1//R2=Rg Ro=Rd Ku=gmRs(1+gmRs) Rt=Rg+(R1//R2)=Rg Ro=Rds/(1+gmRds)=1/gm ????·??? ×??ú???? ?ò????Us=RgIb?°Ug=0 ?ù????Ugs=-RsIo ×??ú????Us=IdRs ????????Ug=EdRp ?ù????Ugs=EdRp-IdRs ·?????????Rp=R2/R1+R2 ????±??à??

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