Electronics Handbook/Devices/Filter/High Pass Filter

CR

Configuration

Characteristics

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

$T=RC$

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

RL

Characteristics

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

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

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

Summary

The two configurations above can be used for Low Pass Filter which has stable voltage which does not change with frequency over high range of frequencies