High Pass Filter Calculator
Calculate cutoff frequency and component values for RC, RL, and op-amp high pass filters
Calculate High Pass Filter Parameters
Filter Results
Calculated Values
Component Values for fc = 0 Hz
Formula: fc = 1 / (2πRC)
Filter Type: RC High-Pass Filter
-3dB Point: At the cutoff frequency, the output is attenuated by 3dB (70.7% of input)
Filter Analysis
Example Calculation
Audio High-Pass Filter
Application: Remove low-frequency noise below 1 kHz
Resistance: 3.3 kΩ
Capacitance: 47 nF
Filter Type: RC High-Pass
Calculation
fc = 1 / (2π × R × C)
fc = 1 / (2π × 3.3×10³ × 47×10⁻⁹)
fc = 1.026 kHz
Filter Types
RC High-Pass
Simple passive filter using resistor and capacitor
fc = 1/(2πRC)
RL High-Pass
Resistor and inductor configuration
fc = R/(2πL)
Op-Amp Filters
Active filters with adjustable gain
Inverting & Non-inverting
Design Tips
High-pass filters block low frequencies and pass high frequencies
Cutoff frequency is where output is -3dB (70.7% of input)
Higher order filters provide steeper roll-off
Op-amp filters can provide gain along with filtering
Understanding High Pass Filters
What is a High Pass Filter?
A high-pass filter is an electronic circuit that allows high-frequency signals to pass through while attenuating (reducing) low-frequency signals. It acts as the opposite of a low-pass filter, effectively blocking frequencies below a specified cutoff frequency.
Applications
- •Audio systems to remove low-frequency noise
- •DC blocking in AC-coupled amplifiers
- •Signal conditioning in data acquisition
- •Radio frequency communications
How It Works
RC High-Pass Filter
The capacitor blocks DC and low frequencies but allows high frequencies to pass. At high frequencies, the capacitor acts as a short circuit.
RL High-Pass Filter
The inductor opposes changes in current. High frequencies see high impedance through the inductor, forcing signals through the output resistor.
Op-Amp Filters
Active filters using operational amplifiers can provide gain while filtering, offering better performance and isolation.