电子学基础/电子滤波器/带通滤波器

LR + CR 带通滤波器

特性

${\frac {V_{o}}{V_{i}}}=({\frac {1}{1+j\omega {\frac {L}{R}}}})({\frac {j\omega RC}{1+j\omega RC}})$

带通，或在一定频率范围内具有稳定电压的频率带

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

前提是

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

RC + RL 带通滤波器

特性

${\frac {V_{o}}{V_{i}}}=({\frac {1}{1+j\omega RC}})({\frac {j\omega {\frac {R}{L}}}{1+j\omega {\frac {R}{L}}}})$

带通，或具有稳定电压的频率带

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

前提是

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

总结

带通滤波器在一定频率范围内具有稳定电压

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

前提是 ${\frac {1}{RC}}>{\frac {R}{L}}$，用于 LR + CR 配置

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

前提是 . ${\frac {R}{L}}>{\frac {1}{RC}}$，用于 CR + LR 配置