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[SOLVED] Common-emitter amplifier

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mr.shocky

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For better understanding of BJT biasing read the book "Introductory Electronic Devices and Circuits 7th ed by Robert T Paynter".
 

mr.shocky said:
I have a few question regarding the common-emitter amplifier with classic / resistive bias
This is a problem from my class that we didn't get the solution
I have been working on them by myself and not feeling too sure about them
So I need someone with better understanding and knowledge to check my answer for me
Click to expand...

You have started your calculation with an input resistance of 1.25kohms at the base. Why? Where originates this value from?
 

There are also obviously incorrect equations like

Rb1 = (12 - 4.7V)/20 µA = 36.5 K

The resulting resistance is actually 365 K, I can just guess that you have chosen one-tenth applying a popular design rule. But if so, you should tell.
 

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