Practical Electronics/Tuned Resonance Selected Band-reject

R - LC

Characteristics

$\frac{V_o}{V_i}=\frac{j\omega L+\frac{1}{j\omega C}}{R+j\omega L+\frac{1}{j\omega C}}$

$T=RC$

${\omega }_o=\frac{1}{T}=\frac{1}{RC}$

R - LC//

Characteristics

$\frac{V_o}{V_i}=\frac{j\omega C+\frac{1}{j\omega L}}{R+j\omega C+\frac{1}{j\omega L}}$

Summary

The two configurations above can be used for /Tuned Resonance Selected Band Reject Filter/