极点 Ls/(s)+R()+(s E S E E L R SI LS+R+ s-+ SC L LC 极点1P2 2 L P1 2R LC 2R 2R LC 故(5) L尔ELE=L pPI p2 1 D S-D极点 ( ) ( ) ( ) s E I s Cs LsI s + RI s + = 1 ( )       + + =       + + = LC s L R s L E sC s Ls R E I s 1 1 1 2 极点p1, p2 ： R LC L R L p 1 2 2 2 1  −      = − + R LC L R L p 1 2 2 2 2  −      = − − 故 ( ) ( )( ) 1 2 1 L s p s p E I s − − = ( ) ( ) ( )       − − − − = 1 2 1 2 1 1 1 L p p s p s p E