High Pass Filter Simulator
Simulate RC high-pass cutoff frequency, gain, and phase response
High-Pass Filter Formulas
| Cutoff frequency | fc = 1 / (2piRC) |
| Magnitude | |H(f)| = (f/fc) / sqrt(1 + (f/fc)^2) |
| Gain in dB | 20 log10(|H(f)|) |
| Phase | phase = atan(fc/f) |
Step-by-Step Example
For R = 1000 ohm and C = 0.1 uF, the cutoff frequency is about 1591.55 Hz. Frequencies far below this value are strongly reduced, while frequencies far above it pass with gain close to 1.
Where High-Pass Filters Are Used
- Blocking DC offset while passing changing signals.
- Removing low-frequency rumble in audio circuits.
- Edge detection and fast signal coupling.
- Signal conditioning before amplification or measurement.
Frequently Asked Questions
What is a high-pass filter?▼
A high-pass filter attenuates low-frequency signals and passes high-frequency signals more easily.
What is the RC high-pass cutoff frequency?▼
For a simple RC high-pass filter, cutoff frequency is fc = 1 / (2 pi R C).
What happens at cutoff frequency?▼
At cutoff frequency, the output magnitude is about 0.707 of the input, or -3 dB.
What does increasing capacitance do?▼
Increasing capacitance lowers the cutoff frequency, allowing lower frequencies to pass.
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