In the circuit shown below, let
R1=1000;R2=4000;Ri=3000;Ro=2000;vs=1;A=1000;
vp=vs;
syms vn vo
[vn,vo]=solve(vn/R1+(vn-vs)/Ri+(vn-vo)/R2,...
(vo-vn)/R2+(vo-A*(vp-vn))/Ro,vn,vo);
is=(vs-vn)/Ri
Rin=vs/is
vn=vpa(vn,11)
vo=vpa(vo,11)
is=vpa(is,11)
Rin=vpa(Rin,11)
Answers:
vn =
0.99306243806
vo =
4.9560621077
is =
0.0000023125206475
Rin =
432428.57143
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