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TC721 Attenuator:
Attenuation Control
Technical Overview
Introduction
The TC721 is a voltage variable attenuator that operates from DC to 50 GHz. This application note
highlights the advantages of the TC721 topology versus those of more traditional attenuators and
explains the function of the DC reference circuit located on the TC721 chip. An example of a driver
circuit for the attenuator is presented. Advantages and disadvantages of the given driver circuit are
also discussed.
2.0 Topology
A schematic drawing of the TC721 attenuator is shown in Figure 1. Traditional GaAs FET attenuators
are based upon the standard resistive T |
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