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RC Low-pass Filter Design Tool

This page is a web application that design a RC low-pass filter. Use this utility to calculate the Transfer Function for filters at a given frequency or values of R and C. The response of the filter is displayed on graphs, showing Bode diagram, Nyquist diagram, Impulse response and Step response.
♦Filters
RC LPF
RC HPF
LR LPF
LR HPF
RLC LPF
RLC HPF
RLC BPF
RLC BEF
Sallen-Key LPF
Sallen-Key HPF
3rd order SallenKeyLPF
3rd order SallenKeyHPF
Multiple feedback LPF
Multiple feedback HPF
Multiple feedback BPF
3rd order Multiple feedback LPF
3rd order Multiple feedback HPF
TwinT notch
CR 2nd order LPF,HPF,BPF
Active filter


Filter index

Calculate the transfer function for low-pass filter with R and C values
Vin(s)→ →Vout(s)
R=Ω C=F
p:pico, n:nano, u:micro, k:kilo, M:mega
Frequency analysis Bode diagram
Nyquist diagram(f=0→∞)
Pole, zero
Phase margin
Oscillation analysis
Transient analysis Step responseImpulse response
Overshoot
Final value of the step response
Calculate the R and C values for the filter at a given frequency
Vin(s)→ →Vout(s)
fc=Hz
C=F (Omitted C=10, 1, 0.1, 0.01…)
p:pico, n:nano, u:micro, k:kilo, M:mega
Select Resistor Sequence:

Frequency analysis Bode diagram
Nyquist diagram(f=0→∞)
Pole, zero
Phase margin
Oscillation analysis
Transient analysis Step responseImpulse response
Overshoot
Final value of the step response
RC Low-pass Filter Design for PWM

Sample calculation


PWM signal		 → →Vout(s)

A simple RC low-pass filter can convert a PWM signal to an analog signal as cheap D/A converter. This tool calculate peak-to-peak ripple voltage and settling time.

fPWM=Hz
Duty Step    0%→[%]
PWM signal voltage
 VL = [V]  VH = [V]
R and C values of filter | Cut-off frequency Cut-off frequency  fc = [Hz]
R and C values
    R=Ω C=F
p:pico, n:nano, u:micro, k:kilo, M:mega

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