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在电子电路中,输入信号通常很微弱,由于单级放大电路的放大倍数较低,仅靠单级放大电路常常不能满足实际需要,因此常把两级或两级以上的单级放大电路连接起来,组成多级放大电路。文章阐述了多级放大电路几种常用的耦合方式,并对多级放大电路的放大倍数与通频带的关系进行了分析。多级放大电路的级数越多,放大倍数越大,而通频带越窄,因此在多级放大电路中应兼顾放大倍数和通频带,避免顾此失彼。
In the electronic circuit, the input signal is usually very weak, single-stage amplifier circuit due to the low magnification, only single-stage amplifier circuit often can not meet the actual needs, so often two or more single-stage amplifier circuit connected , Composed of multi-stage amplifier. This paper describes several commonly used coupling methods of multi-stage amplifier circuits, and analyzes the relationship between amplification and passband of multi-stage amplifier circuits. Multi-stage amplifier circuit more stages, the greater the magnification, while the pass band is narrower, so multi-stage amplifier should take into account the magnification and pass band, to avoid the other side.