直流通道 设:Ues=0 +Upn+20V 则:Vc≈Vs o/10K 150K 而:c=0 D DS R G R D 5V IM R1+R2 R 50K 10K 0.5mA RR UDs =UDp-ID (Rs+RD)=10V设: UGS=0 则: VG VS 而: IG=0 = = 0.5mA SG SS D RV RV I UDS = U DD− ID ( R S + RD ) =10 V 5 V 1 2 2 = + G UD D R R R V 直流通道 +UDD+20V R 1 RD R G R2 150K 50K 1M 10K R S 10K G D S I D UDS I G