Circuit Analysis For Dummies by John Santiago

Author:John Santiago
Language: eng
Format: epub, pdf
Publisher: Wiley
Published: 2013-03-26T16:00:00+00:00

The output voltage vo follows from Ohm’s law:

But the emitter current iE is related to the input base current iB:

You now have an output voltage:

If the output voltage vo is much bigger than Vγ, you can make the following approximation for the base voltage vB:

Solving for the ratio of vB to iB gives you the input resistance:

The input resistance as seen by the base multiplies the emitter resistance by β + 1. Typical values of current gain β vary from 50 to 150. High-input resistance provides isolation between the input and output parts of the circuit. Also, when little current is drawn from the source, you have longer battery life for portable applications, letting you play games on your smartphone for longer stretches.

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