RF Frequeny and Impedance Scaling Calculator

Calculate L and C

LC Resonant Circuit Calculator

The RF Frequency and Impedance Scaling Calculator helps convert low-pass filter prototypes into practical, usable filters. After selecting the appropriate filter type and attenuation response, you begin by noting the low-pass prototype values. The prototype circuit operates with a cutoff frequency of 0.159 Hz and between a normalized source and load resistance of 1 ohm. To transform these values, the capacitor and inductor are scaled using the formulas: C = Cn / (2πf_c R) for the capacitor and L = (R Ln) / (2πf_c) for the inductor, where Cn and Ln are the low-pass prototype element values, and fc is the final cutoff frequency. The prototype source resistor is also scaled by the load resistor to maintain the ratio between source and load.

Some example usage of this online LC parallel resonant circuit calculator are as follows.

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