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Contents
Flashcard status
Presentation
Question
Answer
Question
对于任何电路,BJT放大电路AC分析的步骤:
[...]
Answer
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
\(\displaystyle r_{\pi}= \frac{\beta}{g_{m}}\)
.
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
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
电路输入阻抗:
\(\displaystyle Z_{i}= \frac{v_{i}}{i_{i}}\)
.
电路输出阻抗:
\(\displaystyle Z_{o}= \frac{v_{o}}{i_{o}}\)
.
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
?
Question
对于任何电路,BJT放大电路AC分析的步骤:
[...]
Answer
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
\(\displaystyle r_{\pi}= \frac{\beta}{g_{m}}\)
.
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
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
电路输入阻抗:
\(\displaystyle Z_{i}= \frac{v_{i}}{i_{i}}\)
.
电路输出阻抗:
\(\displaystyle Z_{o}= \frac{v_{o}}{i_{o}}\)
.
电路电压增益:
\(\displaystyle A_{v}= \frac{v_{o}}{v_{i}}\)
.
Summary
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not learned
measured difficulty
37% [default]
last interval [days]
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