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共射极放大电路计算输出电阻Ro为什么不考虑RL？

2025-04-03 13:47:20

推荐回答（2个）

回答1：

输出阻抗是在出口处测得的阻抗。阻抗越小，驱动更大负载的能力就越高。而这里的RL指的是外部的负载，不属于放大电路中的任何一部分。

回答2：

输入电阻与输出电阻是为描述放大器相互连接时所产生的影响而引入的参数，输入电阻与输出电阻均会影响放大器的放大能力。任何放大器输入端口都可等效为一个电阻，任何放大器输出端口都可等效为一个(内阻＋电压源)串联，从放大器输出端看进去的等效内阻即是放大器输出电阻Ro。RL是三极管放大器输出端的负载，不是放大器的输出电阻，所以不必考虑RL。

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