This calculator determines the resistor value (R1) needed for a balanced attenuator based on the target attenuation and system impedance. It helps in designing circuits that reduce signal power while maintaining impedance matching.
Formula
R1 = Z₀ × [ 1 / (10^(dB/20) – 1) ]
Formula Explanation
- Z₀ is the system characteristic impedance (Ω).
- dB is the desired attenuation in decibels.
- The formula ensures equal signal division across both sides for balanced operation.
Example
Input: Attenuation = 10 dB, Z₀ = 50 Ω
Result: R1 ≈ 5.56 Ω
Who uses it
Useful for RF and audio engineers designing circuits that require controlled signal reduction without disrupting impedance balance.