共射放大电路静态工作点漂移抑制与电路结构优化研究

he static operating point is a core parameter of common-emitter amplifier circuits, with its stability directly influencing signal amplification performance and distortion. This paper elaborates on the concept of the static operating point in amplifier circuits, analyzes its impacts on waveform distortion and voltage gain, and identifies temperature as the primary factor causing static operating point drift. Studies on different common-emitter amplifier circuits show that the basic fixed bias circuit features a simple structure but poor stability, being suitable only for scenarios with minimal temperature changes; voltage and current negative feedback bias circuits enhance stability through feedback mechanisms but reduce the voltage gain; the voltage-divider bias circuit stabilizes the operating point via resistor voltage division and current negative feedback from the emitter resistor, with a parallel bypass capacitor maintaining the AC gain; the temperature compensation bias circuit uses thermal-sensitive components to compensate for temperature effects, offering high stability but requiring strict component selection. This research provides a reference for selecting appropriate biasing schemes for common-emitter amplifier circuits according to practical needs..