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kicad/pcb_calculator/attenuators/bridget_tee_formula.md

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Bridged Tee Attenuator

a is attenuation in dB
Zin is desired input impedance in Ω
Zout is desired output impedance in Ω
Z0 = Zin = Zout

L = 10a/20
R1 = Z0 · (L−1)
R2 = Z0 / (L−1)