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// Example6.5 // Design a summing amplifier circuit to provide the output voltage Vo = -(7 V11 + 15 V12 + 10 V13 + 3 V14)
clc;
clear;
close;
R2 = 630*10^3 ; // Assume feedback resistance
// Vo = -(7 V11 + 15 V12 + 10 V13 + 3 V14); equation 1
// the output of the summer circuit is given as
// Vo = -R2((Via/Ria)+(Vib/Rib)+(Vic/Ric)+(Vid/Rid)) equation 2
// compare equation 1 and 2 of Vo we get
// (R2/Ria)= 7 ;
// (R2/Rbi= 15 ;
// (R2/Ric)= 10 ;
// (R2/Rid)= 3 ;
Ria = R2/7 ;
disp('the value of resistance Ria is = '+string(Ria)+' ohm');
Rib = R2/15 ;
disp('the value of resistance Rib is = '+string(Rib)+' ohm');
Ric = R2/10 ;
disp('the value of resistance Ric is = '+string(Ric)+' ohm');
Rid = R2/3 ;
disp('the value of resistance Rid is = '+string(Rid)+' ohm');
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