相减运算电路图.ewb

Multisim2001软件的仿真电路实例261例

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"相减运算电路图" 
"	实现功能：将两个输入信号分别加到运算放大器的反相输入端与同相输入端，适当选择电路参数，输出大小正比于两个输入信号之差。" 
"	在满足深负反馈条件下：" 
"		当ui2=0时，放大器对ui1而言为反相器输入式放大电路。uo1=— ui1*Rf2/Rf1" 
"		当ui1=0时，放大器对ui2而言为同相输入式放大电路，但从ui2到同相输入端要受到Rp1和Rp2组成的分压器的衰减。uo2=(Rp2/(Rp1+Rp2)*(1+Rf2/Rf1)*ui2" 
"	若取Rp1=Rf1=R1，Rp2=Rf2=R2，则有uo1=— ui1*R2/R1,  uo2=ui2*R2/R1" 
"	两个电压同时加上时，总的输出电压为：uo=(R2/R1)*(ui2 — ui1）" 
"	当参与相减的两个信号极性相同时，应考虑放大器输入端的共模输入电压。" 
"" 
"	" 

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