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知识 4 放大电路的另两种基本组态

知识 4 放大电路的另两种基本组态. 一、共集电极电路 二、共基极电路. + V CC. + -. R B. VT. R E. U o. R L. C 1. +. + -. C 2. VT. + -. +. R B. U i. + -. + -. U s. R E. R L. u o. u s. 一、共集电极电路. 交流通路. 负载电阻 R L (经过耦合电容 C 2 )接在三极管的发射极上,输出电压从三极管的发射极取出,所以称为射极输出器。. + V CC. R B. + V CC. C 1. +.

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知识 4 放大电路的另两种基本组态

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  1. 知识4 放大电路的另两种基本组态 • 一、共集电极电路 • 二、共基极电路

  2. +VCC + - RB VT RE Uo RL C1 + + - C2 VT + - + RB Ui + - + - Us RE RL uo us 一、共集电极电路 交流通路 负载电阻RL(经过耦合电容C2)接在三极管的发射极上,输出电压从三极管的发射极取出,所以称为射极输出器。

  3. +VCC RB +VCC C1 + C2 VT RB IC + + - + - IB + RE RL uo us VT + UCE UBE – – RE 1.静态工作点估算

  4. Ib Ii Ic βIb + - +VCC RS rbe RB RB + - Ui Us Ie C1 + + - C2 VT RE RL + Uo + - + - RE RL uo us 微变等效电路 2.电压放大倍数计算 射极输出器的电压放大倍数小于1,接近1。

  5. Ib Ii Ic βIb + - RS rbe RB + - Ui Us Ie + - RE RL Uo Ri' Ri 3.输入电阻计算 输入电阻比较大。

  6. Ic Ib βIb rbe RB RS I + - IRE U RE 4. 输出电阻计算 输出电阻很小。

  7. +VCC RC RB1 C1 C2 + + VT + - RS + - RE uo ui + - RL + us Cb RB2 二、共基极电路

  8. +VCC IC I2 I2 RC RB1 VB VT IB I1 RB2 RE 1.静态工作点估算 其直流通路与分压式工作点稳定电路相同。 UCE≈VCC-IC(RC+RE)

  9. Ic Ii Ie + - + - RS βIb RL RE rbe Uo RC + - Ui Us Ib Ri Ri' 2.电压放大倍数计算 3.输入电阻计算 4.输出电阻计算

  10. 三种基本组态比较

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