Linearizing Microwave Amplifier
Babar Baig and Sean Middleton
Advisors: Dr. S. N. Prasad and Dr. Gary Dempsey
In many RF applications, such as satellite and personal communications,
there is a need for high power with less distortion. This project analyzed
the problems associated with using high power RF amplifiers at 4.0 GHz.
In order to achieve extended input-output power characteristics of an amplifier,
an active feedback methodology was proposed. Design of the system consisted
of a main amplifier, an auxiliary amplifier in the feedback loop, input
and output couplers, and biasing networks. By utilizing active feedback,
non-linearities of the amplifier were reduced and useful linear range of
the amplifier was extended. This project was designed using the EEsof libra
tools and fabricated at the microwave fabrication facility at Bradley University.
Furthermore, final testing proved that active feedback extends the useful
range of the amplifier by approximately 3dB.
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