25射极跟随器性能测试.PDF

2.5 1. 2. I = 0.8mAV = 5V R = 5.1kΩ C CE β e 3. 2.5.1 2.5.1 2.5.1 2.5.2 “” 2.5.1 1 1. 2.5.1 RL ′ R =r +(1+ ) R i be β RL b - 55 - 2 ′ 1 RL =RL Re C ω L ′ r “” β be RL ′ β R R R R R L e L L e ′ R r +(1+ ) R b be β RL b 2.5.2 “” ′ R R =r +(1+ ) b3 i be β RL 1−A V R AV≈1 b3 1−A V ′ Ri ≈rbe+(1+ β) RL R R b1 b2 2. Ro 2.5.1 ⎛r +R ′⎞ R ⎜ be s ⎟ R o ⎜⎝ 1+β ⎠⎟ e ′ r +R be s R e