In the circuit shown below, let
R1=1000;R2=6000;Ri=4000;Ro=500;vs=1;A=2000;
syms vn vo
[vn,vo]=solve((vn-vs)/R1+vn/Ri+(vn-vo)/R2,...
(vo-vn)/R2+(vo-A*(0-vn))/Ro,vn,vo);
is=(vs-vn)/R1;
Rin=vs/is;
vn=vpa(vn,11)
vo=vpa(vo,11)
is=vpa(is,11)
Rin=vpa(Rin,11)
Answers:
vn =
0.0032352392211
vo =
-5.9725004666
is =
0.00099676476078
Rin =
1003.24574
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