Feedforward and predistortion linearizers on an X-band helix-TWT

Research on linearizing an X-band helix-TWT is performed. Both feedforward and predistortion linearizing circuits are designed and fabricated. Output frequency spectra are measured to compare the third order intermodulation distortion amplitudes of the TWT with linearization and without linearizatio...

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Bibliographic Details
Published inFifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786) pp. 174 - 175
Main Authors Ji Han Joo, Min Ho Son, Yong Dug Lee, Jin Joo Choi
Format Conference Proceeding
LanguageEnglish
Published IEEE 2004
Subjects
Circuits
Distortion measurement
Frequency measurement
Intermodulation distortion
Noise figure
Noise measurement
Nonlinear distortion
Power generation
Power measurement
Predistortion
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Summary:Research on linearizing an X-band helix-TWT is performed. Both feedforward and predistortion linearizing circuits are designed and fabricated. Output frequency spectra are measured to compare the third order intermodulation distortion amplitudes of the TWT with linearization and without linearization. When a two-tone signal of 9.5 GHz and 9.505 GHz is injected with 6 dBm input power, the output power is measured to be 1.2 W and the third-order intermodulation distortion (IMD) is 45.6 dB. The third-order IMD is improved by 25.6 dB, compared with the TWT without the linearizing circuit.
ISBN:9780780382619
0780382617
DOI:10.1109/IVELEC.2004.1316258