这种电路交给matlab计算吧
syms s
c7=30e-9
c8=15e-9
c9=15e-9
r1=330e3
r2=220e3
vi=20
z9=1/(s*c9)
z8=1/(s*c8)
z7=1/(s*c7)
z33=r1+(r2*z7)/(r2+z7)
z2=z33*z9/(z33+z9);
hs1=z2/(z8+z2)
hs2=r2*z7/(r2+z7)/(r1+r2*z7/(r2+z7))
hs=hs1*hs2
HS=subs(hs,s,j*2*3.1415926*50)
HS1=subs(hs1,s,j*2*3.1415926*50)
vo=abs(HS)*vi
vs=abs(HS1)*vi
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