Electronics Handbook/Devices/Filter/Band Pass Filter

LR + CR

{\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}}

{\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}}

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

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