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BJT分压器偏置的近似分析方法可以将电路中的BJT转化为等效电路元件来简化电路分析,不过BJT近似分析方法只有在特定条件下(\(\beta R_{E}\geq10R_{2}\))才成立,主要由以下步骤构成:[...]

Answer

\(\beta R_{E}\geq10R_{2}\)时,我们可以直接用等效电路计算\(V_{B}\)\(\displaystyle V_{B}=\frac{R_{2}V_{CC}}{R_{1}+R_{2}}\)
接下来就可以根据路径

\(\begin{array}{c}V_{B}\\\downarrow\\V_{E}=V_{B}-V_{BE}(0.7V)\\\downarrow\\I_{E}=\displaystyle\frac{V_{E}}{R_{E}}\approx I_{C}\\\downarrow\\V_{CE}=V_{CC}-I_{C}(R_{C}+R_{E})\end{array}\)

求得\(I_{C}\)\(V_{CE}\).


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#has-images
Question
BJT分压器偏置的近似分析方法可以将电路中的BJT转化为等效电路元件来简化电路分析,不过BJT近似分析方法只有在特定条件下(\(\beta R_{E}\geq10R_{2}\))才成立,主要由以下步骤构成:[...]
Answer
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Tags
#has-images
Question
BJT分压器偏置的近似分析方法可以将电路中的BJT转化为等效电路元件来简化电路分析,不过BJT近似分析方法只有在特定条件下(\(\beta R_{E}\geq10R_{2}\))才成立,主要由以下步骤构成:[...]

Answer

\(\beta R_{E}\geq10R_{2}\)时,我们可以直接用等效电路计算\(V_{B}\)\(\displaystyle V_{B}=\frac{R_{2}V_{CC}}{R_{1}+R_{2}}\)
接下来就可以根据路径

\(\begin{array}{c}V_{B}\\\downarrow\\V_{E}=V_{B}-V_{BE}(0.7V)\\\downarrow\\I_{E}=\displaystyle\frac{V_{E}}{R_{E}}\approx I_{C}\\\downarrow\\V_{CE}=V_{CC}-I_{C}(R_{C}+R_{E})\end{array}\)

求得\(I_{C}\)\(V_{CE}\).


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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