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某晶体管的耐压(为简便起见,我们称集电极与发射极间能承受的最大电压为耐压)是30伏,利用这种晶体管,能否作一个阻容耦合放大器,其输出电压可以大大超过30伏呢?本文将介绍一种电路,其输出电压可以超过耐压很多,并说明这种电路的一般计算步骤.应该指出,普通的共发射极放大器是达不到要求的.图1绘出一个最简单的共发射极阻容耦合放大器电路.当它作线性运用时(本文只讨论这种情况),输出交流电压u-0的峰值最多等于晶体管耐压U-max之半.
The withstand voltage of a transistor (for brevity, we say that the maximum withstand voltage between the collector and the emitter is withstand voltage) is 30 volts. With this transistor, can it be used as a RC-amplifier with a large output voltage More than 30 V? This article will introduce a circuit whose output voltage can exceed a lot of withstand voltage and illustrate the general calculation steps of this circuit. It should be pointed out that the common emitter amplifier is not up to the requirements. One of the simplest emitter-resistor-capacitor coupled amplifier circuit when it is used linearly (discussed in this article only), the peak value of the output AC voltage u-0 at most equal to half the transistor withstand voltage U-max.