Electronics Handbook/Devices/Filter/Band-pass

Band-pass Filter

A band-pass filter can be constructed from connecting a low-pass filter with a high-pass filter.

Network LR - CR Band-pass Filter

By connecting one low-pass filter LR with one high-pass filter CR a band-pass filter can be formed that can pass the frequency band from $\omega _{1}$ to $\omega _{2}$

Band Pass Range

$\omega _{1}-\omega _{2}$

${\frac {R}{L}}-{\frac {1}{RC}}$

Provide that

${\frac {1}{RC}}>{\frac {R}{L}}$

$R<{\sqrt {\frac {L}{C}}}$

Net work RC - RLBand-pass Filter

By connecting one low pass filter RC with one high pass filter RL a band-pass filter can be formed that can pass the frequency band from $\omega _{1}$ to $\omega _{2}$

$\omega _{1}-\omega _{2}$

${\frac {1}{RC}}-{\frac {R}{L}}$

Provided that

${\frac {R}{L}}>{\frac {1}{RC}}$

$R>{\sqrt {\frac {L}{C}}}$