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kicad/pcb_calculator/attenuators/tee_formula.md

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Tee Attenuator

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

L = 10a/20
A = (L+1) / (L−1)
R2 = 2·√(L · Zin · Zout) / (L−1)
R1 = Zin · A − R2
R3 = Zout · A − R2