This configuration is shown in figure The signal is applied to the base and is taken from the collector. The emitter is the common element to the input and output. The next formulas are used when calculating the hybrid parameters related to this circuit:
Formulas 1
Common emitter:
V1 = Veb
I1 = Ib
V2 = Vce
I2 = Ic
Where:
Veb is the voltage between emitter and base in volts (V)
Ib is the current flowing through the base in amperes (A)
Vce is the voltage between collector and emitter in volts (V)
Ic is the current flowing through the collector in amperes (A)