1、P85: 15.2.1,已知:UCC = 12V,RC = 3k,RB = 240k, = 40。,解:(1),(1) 试用直流通路估算各静态值IB,IC,UCE ;,P85: 15.2.1,已知:UCC = 12V,RC = 3k,RB = 240k, = 40。,连接这两点, 交点Q即为所求。,可得:,(2) 根据公式:,(2) 试用图解法作放大电路的静态工作点;,P85: 15.2.1,已知:UCC = 12V,RC = 3k,RB = 240k, = 40。,(3),(3) 静态时(ui=0) C1和C2上电压为多少?并标出极性。,P86: 15.3.1,利用微变等效电路计算Au。 (
2、1) 输出端开路; (2) RL = 6k。设rbe = 0.8k。,解:微变等效电路如下图,已知:UCC = 12V,RC = 3k,RB = 240k, = 40。,P86: 15.3.1,(1),(2),利用微变等效电路计算Au。 (1) 输出端开路; (2) RL = 6k。设rbe = 0.8k。,已知:UCC = 12V,RC = 3k,RB = 240k, = 40。,P88: 15.4.2,解:(1),已知:UCC = 24V,RC = 3.3k, RE = 1.5k, RB1 = 33k,RB2 = 10k, RL = 5.1k, = 66,设RS0。,(1) 求静态值IB,
3、IC和UCE;,P88: 15.4.2,(2),已知:UCC = 24V,RC = 3.3k, RE = 1.5k, RB1 = 33k,RB2 = 10k, RL = 5.1k, = 66,设RS0。,(2) 画出微变等效电路;,P88: 15.4.2,(3),(4),已知:UCC = 24V,RC = 3.3k, RE = 1.5k, RB1 = 33k,RB2 = 10k, RL = 5.1k, = 66,设RS0。,(3) 计算晶体管的输入电阻rbe; (4) 计算电压放大倍数Au;,P88: 15.4.2,(5),(6),已知:UCC = 24V,RC = 3.3k, RE = 1.5k, RB1 = 33k,RB2 = 10k, RL = 5.1k, = 66,设RS0。,(5) 计算输出开路时的Au,并说明RL对Au 的影响; (6) 估算输入电阻ri和输出电阻r0。,P88: 15.6.1,试求:Au,ri,r0。,解:,已知: RS = 50, RB1 = 100k,RB2 = 30k, RE = 1k, = 50, rbe = 1k。,