See figure attached.
I was able to successfully apply thevenins theorem and obtain the same circuit as him however I am confused as to how he concludes that,
\(v_{I} = V_{T}\)
I would agree that,
\(v_{o} = V_{C} = -I_{C}*5k \)
How does he obtain vi for the gain?
EDIT: It seems as though hes doing the following,
\(A_{vo} = -g_{m} R_{C}\)
but isn't that incorrect because,
\(V_{o} - 5 = -g_{m}v_{\pi} R_{C} , \quad V_{o} = -g_{m}v_{\pi} R_{C} + 5\)
Since, \(V_{i} = V_{\pi}\)
\(\rightarrow A_{vo} = -g_{m}R_{C} + \frac{5}{v_{\pi}}\)
EDIT: I'm gonna give this one another attempt from the start and see what I get.
I was able to successfully apply thevenins theorem and obtain the same circuit as him however I am confused as to how he concludes that,
\(v_{I} = V_{T}\)
I would agree that,
\(v_{o} = V_{C} = -I_{C}*5k \)
How does he obtain vi for the gain?
EDIT: It seems as though hes doing the following,
\(A_{vo} = -g_{m} R_{C}\)
but isn't that incorrect because,
\(V_{o} - 5 = -g_{m}v_{\pi} R_{C} , \quad V_{o} = -g_{m}v_{\pi} R_{C} + 5\)
Since, \(V_{i} = V_{\pi}\)
\(\rightarrow A_{vo} = -g_{m}R_{C} + \frac{5}{v_{\pi}}\)
EDIT: I'm gonna give this one another attempt from the start and see what I get.
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