Capacitively coupled two-stage amplifier connected by two common-emitter transistor amplifiers

Capacitively coupled two-stage amplifier connected by two common-emitter transistor amplifiers

Shown is a capacitively coupled two-stage amplifier formed by connecting two common-emitter (e) transistor amplifiers to achieve higher amplification
. The output of the front-stage common-emitter (e) transistor amplifier is coupled to the input end of the subsequent-stage common-emitter (e) transistor amplifier
through the capacitor c2. The coupling function of the capacitor is to pass AC and block DC. Using capacitor coupling can prevent the DC bias voltage of a certain amplifier stage from affecting
the DC bias voltage of the next stage. However, the AC signal can be directly sent to the next stage through the coupling capacitor . level amplifier.