Chebyshev Low-Pass Filter Calculator
Generate initial capacitor and inductor values for the two Chebyshev low-pass filter topologies shown below. Choose the filter order, cutoff frequency, passband ripple and impedance for your design.
Use the units printed beside each field. On a small screen, scroll the calculator horizontally to see all inputs and results.
Inputs and units
- n
- Filter order; this legacy calculator supports odd orders from 1 to 9 and raises an even entry to the next odd order.
- c (MHz)
- Cutoff frequency in megahertz.
- r (dB)
- Passband ripple in decibels.
- z (Ω)
- Impedance in ohms.
- C / L
- Returned capacitor values are in pF; returned inductor values are in nH.
How to use this calculator
Select Type 1 or Type 2 using the circuit diagrams, then read the matching component row after calculation. Start with n = 3, c = 1000 MHz, r = 0.1 dB and z = 50 Ω to explore the tool.
Reading the results
Read capacitor values in picofarads (pF) and inductor values in nanohenries (nH) from the row matching your chosen topology.
Before using the result in a design
The calculated LC values are ideal starting values. Choose available parts and verify their tolerance, Q, self-resonant frequency and PCB parasitics in simulation and measurement.
Blank fields use the tool’s built-in example defaults; always enter and check your actual design values.
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