Common-emission common-emitter amplifier circuit is the most widely used triode connection in amplification circuit, the signal is input from the triode base and emitter, and output from the collector and emitter.
1, the input signal and the output signal are reversed;
2, has a large current and voltage gain;
3, generally used as the intermediate stage of the amplifier circuit. The voltage amplification factor is large, the power amplification factor is maximum, the current amplification factor is large =β,