Electronics Handbook/Devices/Filter/Band Pass Filter

LR + CR

Characteristics

$\frac{V_o}{V_i}=(\frac{1}{1+j\omega \frac{L}{R}})(\frac{j\omega RC}{1+j\omega RC})$

Band Pass or band of frequencies that has a stable voltage

$\frac{R}{L}-\frac{1}{RC}$ provided that $\frac{1}{RC}>\frac{R}{L}$

RC - RL

Characteristics

$\frac{V_o}{V_i}=(\frac{1}{1+j\omega RC})(\frac{j\omega \frac{L}{R}}{1+j\omega \frac{L}{R}})$

Band Pass or band of frequencies that has a stable voltage

$\frac{1}{RC}-\frac{R}{L}$ provided that $\frac{R}{L}>\frac{1}{RC}$

Summary

The two configurations above can be used to construct Band Pass Filter which has stable frequency over a range of frequencies w1 - w2 Template:BookCat