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T-Pad Attenuator Calculator

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T-Pad Attenuator Calculator
dB
Ω
Please enter valid values greater than 0.
RESULTS
R1
Ω
R2
Ω

T-Pad Attenuator Diagram

IN OUT R1 R1 R2 T-Pad Attenuator Two series resistors and one shunt resistor

Formulas

K = 10^(Attenuation / 20)
R1 = Z0 × ((K - 1) / (K + 1))
R2 = 2 × Z0 × (K / (K² - 1))

Diagrams & Theory

A T-pad attenuator uses two equal series resistors and one shunt resistor to reduce signal level while maintaining impedance matching.

Example

Input Example

Attenuation: 10 dB
Impedance: 50 Ω

Output

The calculator gives R1 and R2 resistor values for a matched T-pad attenuator.

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About this tool

T-Pad Attenuator Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.