kicad/pcb_calculator/attenuators/pi_formula.md

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Pi Attenuator

a is attenuation in dB
Zin is desired input impedance in Ω
Zout is desired output impedance in Ω

K = VI/VO = 10a/20
L = K2 = 10a/10
A = (L+1) / (L1)

R2 = (L1) / 2·√(Zin · Zout / L)
R1 = 1 / (A/Zin 1/R2)
R3 = 1 / (A/Zout 1/R2)