Attenuator

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Attenuator Design Tutorial

Introduction

Attenuators are devices used to adjust signal levels, to control impedance mismatch and to
isolate circuit stages.

Passive design

Passive attenuators consist of two types ‘pi’ and ‘Tee’ attenuators.

(1) Pi Attenuator

The circuit for the Pi attenuator is shown in Figure 1.

R3 Zout




Zin

R1 R2




Zin >= Zout

Figure 1 Pi Attenuator

1
L

R3 = 10 10 1 Zin * Zout
2 L
10