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(三)晶体管功率放大级功举放大级的作用是将电信号放大后供给负载(如扩音喇叭)以一定量的功率.它的设计必须使得在允许谐波系数及最大效率的条件下,放大级能给出最大可能的功率,而对它的放大系数的要求是次要的.考虑到放大级外部负载阻抗要与晶体管在确定工作状态下的最佳负载阻抗相匹配,级问宜用具有适当变换比的变压器耦合.在实际电路中由于晶体管共发射极连接时功率放大最强,故这种电路形式是常用的.
(C) Transistor Power Amplifier Power amplifier power amplifier is the role of large-scale amplification of the electrical signal to the load (such as PA speakers) to a certain amount of power. It must be designed to allow the harmonic coefficients and maximum efficiency conditions, Amplifier stage gives the maximum possible power, while its amplification factor is secondary. Considering that the external load impedance at the amplifier stage is matched to the optimum load impedance of the transistor under certain operating conditions, Transformer coupling with appropriate conversion ratio In the actual circuit, the power amplifier is most commonly used when the transistor is connected in common emitter. Therefore, this circuit form is commonly used.