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Question
BJT分压器偏置的精确分析方法可以计算出分压器偏置放大器电路准确的工作点,主要由以下步骤构成:[...]
Answer

  1. 将电路替换成DC等效电路,同时使用戴维南等效电路方法获得等效电阻\(R_{Th}\)和等效电压源\(V_{Th}\)
  2. 对DC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. Input loop: \(\displaystyle I_{B}=\frac{E_{Th}-V_{BE}}{R_{Th}+(\beta+1)R_{E}}\)
    2. Output loop: \(\begin{array}{c}I_{C}=\beta I_{B}\\V_{CE}=V_{CC}-I_{C}(R_{C}+R_{E})\end{array}\)
  3. \(V_{BE}\)视为0.7V,计算\(I_{B}\rightarrow I_{C}\rightarrow V_{CE}\).
    1. 当输出环中\(V_{CE}=0\)时,集极饱和电流\(I_{C}=I_{Csat}\).

Question
BJT分压器偏置的精确分析方法可以计算出分压器偏置放大器电路准确的工作点,主要由以下步骤构成:[...]
Answer
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Question
BJT分压器偏置的精确分析方法可以计算出分压器偏置放大器电路准确的工作点,主要由以下步骤构成:[...]
Answer

  1. 将电路替换成DC等效电路,同时使用戴维南等效电路方法获得等效电阻\(R_{Th}\)和等效电压源\(V_{Th}\)
  2. 对DC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. Input loop: \(\displaystyle I_{B}=\frac{E_{Th}-V_{BE}}{R_{Th}+(\beta+1)R_{E}}\)
    2. Output loop: \(\begin{array}{c}I_{C}=\beta I_{B}\\V_{CE}=V_{CC}-I_{C}(R_{C}+R_{E})\end{array}\)
  3. \(V_{BE}\)视为0.7V,计算\(I_{B}\rightarrow I_{C}\rightarrow V_{CE}\).
    1. 当输出环中\(V_{CE}=0\)时,集极饱和电流\(I_{C}=I_{Csat}\).

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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