Fundamentals of Electronics 1 by Muret Pierre;

Author:Muret, Pierre;
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2017-08-15T00:00:00+00:00

By disregarding the current in rCE relative to iC1:

and eg = rBBꞌig + rBꞌEiB1.

Since the node equation at base Bꞌ, when accounting for the current division ratio in rBꞌE and CBꞌE, gives:

we write disregarding the current in CBꞌC relative to iC1. We then have:

We obtain (with Av >> 1 at the numerator):

The effect of the time constant located at the numerator can be disregarded since it is much lower than that of the denominator, which will determine the cutoff frequency of the voltage gain. Numerical verification:

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