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.

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
    Phase  Group delay
Nyquist diagram
Pole, zero
Phase margin
Oscillation analysis

Upper and lower frequency limits:
  f1= - f2=[Hz] (frequency limits are optional)

Transient analysis

Step response
Impulse response
Overshoot
Final value of the step response

Simulation time:
  0 - [sec] (optional)


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
    Phase  Group delay
Nyquist diagram
Pole, zero
Phase margin
Oscillation analysis

Upper and lower frequency limits:
  f1= - f2=[Hz] (frequency limits are optional)

Transient analysis

Step response
Impulse response
Overshoot
Final value of the step response

Simulation time:
  0 - [sec] (optional)


RC Low-pass Filter Design for PWM


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