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Pi Attenuator Circuit

The Pi-pad attenuator is so called because its design resembles that of the Greek letter pi ( π ) meaning that it has one series resistor and two parallel shunt resistors to ground at the input and the output. The Pi-pad attenuator is another fully symmetrical purely resistive network that can be used as a fixed attenuator between equal impedances or for impedance matching between unequal impedances.


Enter A, Zi and Zo (all three are required) to calculate R1, R2 and R3.

Pi Attenuator Circuit Attenuation (A): dB
Input Impedance (Zi):
Output Impedance (Zo):