This calculator determines the values of resistors R1 and R2 for an attenuator in configuration T, from the desired attenuation (in dB) and the characteristic impedance of the system (Z0). It allows precise adjustment of signal loss while maintaining impedance matching.
Formulas
R1(Ω) = Z0 × ( ( 10 (dB/20) − 1 ) / ( 10 (dB/20) + 1 ) )
R2(Ω) = 2 × Z0 × ( 10 (dB/20) / ( 10 (dB/10) − 1 ) )
Explanation of formulas
The values of R1 and R2 are calculated to create a given attenuation while ensuring that the input and output impedance remain equal to Z0. R1 is the series resistors and R2 is the central bypass resistor. The balance between these resistors guarantees precise attenuation and optimal signal adaptation.
Uses of the calculator
- Rapid design of impedance-matched RF attenuators.
- Reduced signal level for testing or measurements.
- Protection of amplifier stages against excessive signals.
- Useful tool for RF engineers, technicians and analog circuit designers.