取 XL = jωL,Xc = 1/(jω*C); S = jω;
Uo = Ui*(R2//Xc) / (R2//Xc + R1 + XL);
所以 f() = Uo/Ui = (R2//Xc) / (R2//Xc + R1 + XL);
其中:
分子: R2//Xc = R2*Xc/(R2+Xc) = R2/SC*(R2+1/SC) = R2/(R2*SC + 1);
分母: R2//Xc + R1 + XL = R2/(R2*SC +1) + R1 + SL
= [(R2+(R1+SL)*(R2*SC+1)] /(R2*SC +1) ;
那么 f()= R2/(R2*SC + 1) / [(R2+(R1+SL)*(R2*SC+1)] /(R2*SC +1)
= R2 / [(R2+(R1+SL)*(R2*SC+1)];
= R2/ [ R2+R1+S(L+R1*R2*C)+R2*L*C*S*S ];
;
在文本方式下,不好书写数学
表达式,希望你能够看明白;
追问非常感谢。