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Results tagged with bjt
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user 247536
BJT stands for Bipolar Junction Transistor. It is a three-terminal electronic device constructed of doped semiconductor material and may be used in amplifying or switching applications.
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Finding the necessary currents for AC analysis for CE NPN BJT amplifier
I have this circuit with a CE NPN-BJT amplifier and I am struggling to find the necessary values for calculating r(pi) for AC analysis, i.e. the hybrid-pi model:
$$r_{pi} = \frac{V_{thermal}}{I_b}$$ … This means that V(b) = 0 I can then use the active region model of NPN BJT for DC analysis to write down the KVL which gives me something like this: -0.7 - 60(I[e]) = 0
I solve the equation and end up …
- 103
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Where does the input resistance formula of a BJT amplifier come from?
Is that derived from the Thevenin equivalent of the BJT? …
- 103