Electronics Handbook/Devices/Filter/Low-pass

Low-pass fILTER

A low-pass filter is an electronic device that has stable voltage that does not change over a range of low frequencies.

Configurations

Network LR Low-pass Filter

$\frac{V_o}{V_i}=\frac{Z_R}{Z_R+Z_L}=\frac{1}{1+j\omega T}$

$T=\frac{L}{R}$

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

Net Work RC Low-pass Filter

$\frac{V_o}{V_i}=\frac{Z_C}{Z_R+Z_C}=\frac{1}{1+j\omega T}$

T = RC

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