Electronics Handbook/Devices/Filter/High-pass

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

Configurations

High-pass RL Filter

${\frac {V_{o}}{V_{i}}}={\frac {Z_{L}}{Z_{R}+Z_{L}}}={\frac {j\omega T}{1+j\omega T}}$

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

$\omega _{o}={\frac {1}{T}}$

High-pass CR Filter

${\frac {V_{o}}{V_{i}}}={\frac {Z_{R}}{Z_{R}+Z_{C}}}={\frac {j\omega T}{1+j\omega T}}$

T = RC

$\omega _{o}={\frac {1}{T}}$