kicad/pcb_calculator/attenuators/tee_formula.md

Tee Attenuator

Zin desired input impedance in Ω
Zout desired output impedance
Zin = Zout

• a attenuation in dB
• L = 10^a/20 (the loss)
• A = (L + 1) / (L - 1)
  
  
• R2 = 2 √ (L * Z_in * Z_out ) / (L - 1)
• R1 = Z_in * A - R2
• R3 = Z_out * A - R2