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// Example6.4 // Design a op-amp circuit to provide the output voltage Vo = -2(3 V1 +4 V2 +2 V3)
clc;
clear;
close;
// Vo = -2(3 V1 + 4 V2+ 2 V3); equation 1
// the output of the summer circuit is given as
// Vo = -R2((Via/Ria)+(Vib/Rib)+(Vic/Ric)) equation 2
// compare equation 1 and 2 of Vo we get
// (R2/Ria)= 6 ;
// (R2/Rbi=8 ;
// (R2/Ric)=4 ;
R2 = 120*10^3 ; // we choose then
Ria = R2/6 ;
disp('the value of resistance Ria is = '+string(Ria)+' ohm');
Rib = R2/8 ;
disp('the value of resistance Rib is = '+string(Rib)+' ohm');
Ric = R2/4 ;
disp('the value of resistance Ric is = '+string(Ric)+' ohm');
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