差分放大电路单端输入信号的射极耦合传输及等效变换-渤海大学.PDF

: 差分放大电路单端输入信号的射极耦合传输及等效变换 任骏原 ( , 　121000) 　:用电路分析的方法对差分放大电路单端输入信 号的射极耦合传输及等效变换 行了深入研究, 目的是探索单 端输入差分放大电路中输入信号的作用过程。 差分放大电路的单端输入信号, 经差分管的发射极耦合传输, 在输入回路可 等效变换为差模输入信号、共模输入信号的叠加, 且等效变换时与发射极电阻R e 取值大小无关, R e 取值大小反映了对共模 输入信号的抑制程度。所述方法的创新点是给出了单端输入信号在输入回路作用下的物理过程, 完善了单端输入信 号的等 效变换方法。 :差分放大电路;单端输入;射极耦合传输;等效变换 :TN702-34　　　　　:A 　　　　　:1004-373X(2010)19-0112-02 Emitter Coupling Transmission and Equivalent Transf ormation of Single-end Input Signal in Differential Amplifier REN Jun-yuan (Department of Physics, ohai University, Jinzhou 121000, China) Abstract:The emitter coupling transmission and equivalent transformation of the single-end input signal in a differential amplifier are researched with the circuit analysis method.It′s aimed to explore the activity process of input signalin differenti- al amplifier circuit.It′s concluded that the input signal, which is transmitted by the emitter of differential amplifier, is equiva- lent to the superposition of common-mode signals and difference-mode signals in the input circuit.This equivalent transforma- tion has nothing to do with the value of emitter resistance R , w hich only reflects the suppression degree of common-mode sig- e nals.The innovation of his described method is that the physical processes of input signal′s activity in input circuit is given and the equivalent transformation method of single-end input signal is improved. Keyw ords:differential amplifier;single-end input;emitter coupling transmission;equivalence transformation 0 　　 1 　 1, 1, ui T1 ui