wlwo 

 Graph 25. Impedance of a parallel resonant circuit 



1-0 



c 



3 

 vP 



01 



001 



L/2 



L/2 



Low-pass u^c is at 

 2/(Z.C)'/2 



High -pass — - — 



O-OUiLCW 



I . I I I I I 1 1 



2c 



2c 



HI- 



High-pass ujq is at 

 1/2(Z.C)i/2 



Low-pass 



I I I 1 1 1 1 1 Ill I I I I 1 1 



20 



CD 

 T3 



(/) 

 O 



C 



o 



i/i 



c 



J^O 



01/(/.C)l/2 1/(/.C)'/2 



uy increasing ^ 



]0/{LC)V2 100/(/.C)i/2 



Grflp/i 26. Transmission characteristic of classical filter section 



275 



