Hello

I am currently designing a common emitter amplifier with a gain of 80
I have managed to calculate what values of resistors and capacitors is needed to achieve a gain of 80.
How can I calculate the input and output impedance?

Thanks

 

hi Ibrahim,
This should explain.
https://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/amplifier-impedances/
E

 

hi Ibrahim,
This should explain.
https://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/amplifier-impedances/
E

There is some values I don't understand,
rEE = 26mV/1mA = 0.26Ω
Where did 26mV and 1 mA come from

 

One thread is enough.
Common emitter amplifier BJT.