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Question
对于任何电路,BJT放大电路AC分析的步骤:[...]
Answer
  1. 对电路进行DC分析,使用得到的\(I_{C}\)计算BJT混合π模型的跨导(Trans-conductance)\(\displaystyle g_{m}= \frac{I_{C}}{V_{T}}\)和BJT输入阻抗\(\displaystyle r_{\pi}= \frac{\beta}{g_{m}}\).
  2. 将原电路中的直流源和电容替换为短路等效,去除所有被短路等效短路的元件。将电路中的BJT替换为混合π模型,并且将此时的电路整理成更方便的形式
  3. 对等效电路中的输入环(Input loop)和输出环(Output loop)分别应用KVL进行分析
    1. 电路输入阻抗:\(\displaystyle Z_{i}= \frac{v_{i}}{i_{i}}\).
    2. 电路输出阻抗:\(\displaystyle Z_{o}= \frac{v_{o}}{i_{o}}\).
    3. 电路电压增益:\(\displaystyle A_{v}= \frac{v_{o}}{v_{i}}\).

Question
对于任何电路,BJT放大电路AC分析的步骤:[...]
Answer
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Question
对于任何电路,BJT放大电路AC分析的步骤:[...]
Answer
  1. 对电路进行DC分析,使用得到的\(I_{C}\)计算BJT混合π模型的跨导(Trans-conductance)\(\displaystyle g_{m}= \frac{I_{C}}{V_{T}}\)和BJT输入阻抗\(\displaystyle r_{\pi}= \frac{\beta}{g_{m}}\).
  2. 将原电路中的直流源和电容替换为短路等效,去除所有被短路等效短路的元件。将电路中的BJT替换为混合π模型,并且将此时的电路整理成更方便的形式
  3. 对等效电路中的输入环(Input loop)和输出环(Output loop)分别应用KVL进行分析
    1. 电路输入阻抗:\(\displaystyle Z_{i}= \frac{v_{i}}{i_{i}}\).
    2. 电路输出阻抗:\(\displaystyle Z_{o}= \frac{v_{o}}{i_{o}}\).
    3. 电路电压增益:\(\displaystyle A_{v}= \frac{v_{o}}{v_{i}}\).

Summary

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

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