同相输入式相加电路图.ewb

Multisim2001软件的仿真电路实例261例

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"同相输入式相加电路图" 
"	所有参与相加的信号均送到放大器的同相输入端。在满足深负反馈条件下，计算诸输入信号的传输比例系数时，可将输入端视为虚短路。" 
"	输出电压为：uo=Rf2（ui1/R1+ui2/R2+ui3/R3)" 
"			R1//R2//R3//Rp=Rf1//Rf2" 
"	它的输入电阻并不大，因为某一路的信号源与同相输入端所接电阻，对其它各路来说，等效于接在同相输入端与地之间的电阻，使放大器的等效输入电阻为之减小。" 
"	它与反相输入式相加运算电路的显著不同之处是：不能通过改变一个电阻，单独改变某一路的传输比例系数。因为各路的会聚点——放大器的同相输入端的电压，会随任一输入电压的改变而发生变化。即各输入信号之间会相互影响。所以，同相输入式相加运算器具有同普通电阻网络相加器相同的缺点。" 
"	与同相放大器一样的缺点：输入端有较大的共模电压。" 
"	" 
"" 

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