Bjt common emitter amplifier.
We want a gain Av and a collector current Ic, and we have a Vcc supply and a typical hFE. So:
Ve = Vcc/(2Av+1)
Re=Ve/IC
Rc=Av*Re
Then to bias the base:
Rb = Re*hFE/10
Vb=Rb*IC/hFE+0.65+Ve
and so:
Rh=Vcc*Rb/Vb
Rl=Rhb*Rb/(Rhb-Rb)
Vout swings between Vcc and 2*Ve.
Zin=Re*hFE//Rh//Rl.
Cin=1/(2πZin*f)
Power dissipated by transistor is (Vcc-Ve)*Ic.
Re makes transistor less dependent on beta and fixes thermal issues also:
k=-2.5mV/°C,
∆T=Ve/(20*k).
Enjoy
