DC and AC paths b of common collector amplifier circuit

DC and AC paths b of common collector amplifier circuit

 (3) DC and AC paths of common collector amplifier circuit
When analyzing the common collector amplifier circuit
, it can also be divided into two paths, DC and AC, as shown in the figure.     The DC path of this circuit is a circuit in which the power supply provides DC bias voltage to the transistor. Whether the transistor works in the amplification state or the switching state
is mainly determined by its bias voltage. This circuit is also the circuit that provides energy to the transistor.
    The AC path is a circuit that acts on AC signals. The capacitor can be regarded as a short circuit to the AC signal, and the internal resistance of the power supply can also be regarded
as a short circuit to the AC signal.