Electronics Fundamentals/Electronic Filter/High Pass Filter

CR High Pass Filter

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 High Pass Filter

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

High Pass Filter has stable voltage which does not change with frequency over a range of high frequency . High Pass Filter can be constructed from CR or RL network