State Variable Filter: One Biquad Structure, Three Simultaneous Outputs
Jeongeun Kim
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18 posts published so far
FIR Lowpass Kaiser Window: Linear-Phase Precision for Control Signal Filtering
Jeongeun Kim
Butterworth Lowpass 4th Order: 80 dB/Decade Rolloff With Zero Passband Ripple
Jeongeun Kim
High Shelf Biquad: Boost High Frequencies Without Distorting Your Control Bandwidth
Jeongeun Kim
Low Shelf Biquad: DC-Range Gain Shaping Without Integrator Wind-Up
Jeongeun Kim
Allpass Filter 2nd Order: Pure Phase Shift Without Touching the Magnitude Spectrum
Jeongeun Kim
Elliptic Lowpass 2nd Order: Maximum Stopband Attenuation at Minimum Filter Order
Jeongeun Kim
Chebyshev Type II Lowpass 2nd Order: Flat Passband, Guaranteed Stopband Attenuation
Jeongeun Kim
Chebyshev Type I Lowpass 2nd Order: Trade Ripple for a Steeper Rolloff
Jeongeun Kim
Bessel Lowpass 2nd Order: When Group Delay Flatness Outranks Magnitude Rolloff
Jeongeun Kim
PID Derivative Filter: Kill the Derivative Kick Before It Kills Your Loop
Jeongeun Kim
Moving Average Filter FIR: The Simplest ADC Post-Processor That Actually Works
Jeongeun Kim
Notch Filter 2nd Order: Surgically Remove a Single Frequency Without Touching the Rest
Jeongeun Kim
First-Order IIR Lowpass: The Universal Pre-Filter Every Control Loop Needs
Jeongeun Kim
Butterworth Bandpass Filter 2nd Order: Isolate a Frequency Band with a Single Biquad
Jeongeun Kim
Butterworth Lowpass Filter 2nd Order: 40 dB/decade Rolloff
Jeongeun Kim
Butterworth Lowpass Filter 2nd Order: Maximally Flat Magnitude, Minimal Ripple
Jeongeun Kim
Butterworth Highpass Filter 2nd Order: Maximally Flat, But At What Phase Cost?
Jeongeun Kim