单端输入差分放大电路输入信号的等效变换本文对单端输入差分放大电路发射极耦合传输的分析方法进行了深入研究，利用电路分析的方法将单端输入信号等效变换成差模输入信号与共模输入信号的叠加。指出等效变换并不需要发射极电阻R。很大的条件，R。的取值大小只反映对共模输人信号的抑制程度。并把这种方法与输人信号用数学方法等效变换进行了对比，得出这两种输入信号的等效变换方法具有等效性的结论。并介绍了单端输入差分放大电路的教学处理方法。Analysis methods of emitter coupling transmission in differential amplifier have been researched．Through circuit analysis，single end input signals have been converted to superposition of common—mode signals and difference-mode signals．Condition of big emit—port resistance R。is not necessary when perfclITn this equivalent transform．The value of R。only reflects the suppression degree of common—mode signals．Compared with mathematical transformation methods of input signal，the conclusion that the two methods are equivalent has been drawn．At last，teaching processing methods of single-end input differential ampli—fier are introduced．