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RC High-Pass Filter

An RC high-pass filter passes high frequencies and attenuates low ones, the opposite of the low-pass filter, and is often used to remove a DC level (AC coupling). The capacitor and resistor simply swap places compared with the low-pass filter, but the corner-frequency formula is the same.

f_c=\dfrac{1}{2\pi RC}

corner frequency of an RC high-pass

Symbols

$R$	resistance	$\Omega$
$C$	capacitance	F
$f_c$	corner frequency	Hz

Example

$R=1$ kΩ, $C=1$ µF:

$f_c=1/(2\pi\cdot10^3\cdot10^{-6})\approx159$ Hz.

High-pass and low-pass share the same corner-frequency formula – it is the placement of R and C that decides the type.

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Part of Electronics: Filters and signals.