https://ibb.co/TPFZbQn In calculation of gain why r_o (output resistance of transistor) doesn't count in output resistance? Why only Rc is written in gain calculation? |
by Aig
August 12, 2021 |
Your reference takes forever to open, for me. I assume that you use a BJT in common emitter, like in Wikipedia, figure 2. Any resistor (or complex impedance) between $V_{out}$ and the ground would tend to bypass the transistor and $V_E$. An exceptionally low resistor, imagine a wire, will bypass it entirely. A larger one will have less bypassing effect and we reach a maximum effect with an infinite resistor, or an open circuit between $V_{out}$ and the ground. So is the formulation $A_v$ as the maximum possible one. |
by vanderghast
August 12, 2021 |
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