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RC High Pass Filter Calculator
Calculate RC high-pass filter cutoff frequency, reactance, gain, phase shift, output amplitude, and attenuation at a selected test frequency.
Input Parameters
Results
Equations Used
Cutoff Frequency: fc = 1 / (2πRC)
Reactance: Xc = 1 / (2πfC)
High-Pass Gain: |H(f)| = f / √(f² + fc²)
Gain in dB: 20log10(|H|)
Phase: φ = atan(fc / f)
Frequently Asked Questions (FAQ)
Q1: What does an RC high pass filter do?
It attenuates low-frequency signals and passes signals above the cutoff frequency.
Q2: What is the -3 dB cutoff frequency?
The cutoff frequency is the point where output amplitude is about 70.7% of input amplitude.
Q3: Can I use this calculator for audio coupling capacitors?
Yes. Enter the coupling capacitor and input resistance to estimate the low-frequency rolloff.
Q4: Does this include source and load impedance?
No. This is an ideal single-pole RC model. Real circuits may need source and load impedance included.
Q5: What phase shift does a high pass filter create?
The output leads the input at low frequencies and approaches 0° phase shift at high frequencies.
Q6: Is this suitable for precision filter design?
Use it for first-order estimates. Precision designs require component tolerance, loading, and simulation checks.
