Electronics Fundamentals/Electronic Filter/Low Pass Filter

RC Low Pass Filter

Configuration

Characteristics

$\frac{V_o}{V_i}=\frac{\frac{1}{j\omega C}}{R+\frac{1}{j\omega C}}=\frac{1}{1+j\omega T}$

$T=RC$

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

LR Low Pass Filter

Characteristics

$\frac{V_o}{V_i}=\frac{R}{R+j\omega L}=\frac{1}{1+j\omega T}$

$T=RC$

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

Summary

Low Pass Filter has a stable voltage which does not change with frequency over a low range of frequency . Low Pass Filter can be constructed from RC, LR Template:BookCat