Getting the error: Solution does not exist because the system is inconsistent.

Question

Lucas Klootwijk 2021-1-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/714078-getting-the-error-solution-does-not-exist-because-the-system-is-inconsistent

回答： Walter Roberson 2021-1-11

Hello, I am trying to do nodal anlysis of a power amplifier circuit but somehow I get an error. My code goes as follows:

syms Vplus Vmin Vi Vo V1;
syms w;
Vi=18;
R1= 220000;
C1= (810^-6);
R2=1000;
R3=20000;
C2=(20010^-12);
R4=1000;
C3=(27010^-6);
R5=24000;
eqns = [Vi(1/R1 + 1iwC1) - V1(1iwC1)==0,
     V1(1iwC1 + (1/R2) + (1/R3)) - Vi(1iwC1)- Vplus(1/R3)==0,
     Vplus(1/R3 + 1iwC2 + 1/(10^12)) - V1(1/R3) - Vmin(1/(10^12)) ==0,
     Vmin(1/(10^12) + ((1iwC3)/(R41iwC3+1)) + 1/R5) - Vplus(1/(10^12)) - Vo(1/R5)==0,
     Vo( 1/R5 + 1/125) - Vmin(1/R5) - (10^6)Vi(1/125)==0];
[A,b] = equationsToMatrix(eqns,[V1, Vplus, Vmin, Vo]);
vars = symvar(eqns);
X = linsolve(A,b);
Vo = X(4);
T = (Vo/Vi);
f = logspace(1,1000000);
T = subs(T, w, 2pi*f);
H = abs(T);

The error log says:

>> PowerAmplifierMatLab
Warning: Solution does not exist because the system is inconsistent. 
In symengine
In sym/privBinaryOp (line 1034)
In sym/linsolve (line 63)
In PowerAmplifierMatLab (line 19)