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PIN diode controlled variable RF attenuator

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joaorob

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Helo everyone,

I'm a telecommunications student and I recently enter on a project that consists on constructing a printed circuit which can attenuate (or not ) a AC signal. The attenuation should be controlled by a DC Voltage. The working frequency should be 2.4 Ghz.
I already found some data in the internet. I would be really gratefull if someone can give me more information about this subject.

Looking foward to hear from you

João Vieira
 

jiripolivka

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I suggest you to study a textbook on microwave techniques. PIN diodes are special type of diodes which do not rectify the AC (microwave) signal but they vary their resistance by an applied DC current.
You can find instructions on building PIN attenuators as "white papers" by Agilent and other PIN diode manufacturers. Designing an attenuator at 2.4 GHz is relatively easy with good PINs. Some manufacturers also offer "Voltage variable attenuators" as complete MMICs for an easy installation; try RFMD and Hittite, for example.
 

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