Summary
International Symposium on Antennas and Propagation
2011
Session Number:FrP1
Session:
Number:FrP1-55
IMD Improvement of X-band TWT Amplifier with Predistorted Linearizer
Won Choi, Kyung Heon Koo,
pp.-
Publication Date:2011/10/25
Online ISSN:2188-5079
Summary:
This paper has analyzed the AM-AM and AM-PM characteristics of X-band TWT used for satellite communication and improved its linearity and IMD performance by using predistortion with linearizer. The TWT amplifier with the linearizer shows better AM-AM and AM-PM conversion, and has increased the 1dB compression point by 12.3dB and 2.0?/dB phase distortion point by 10dB. The 3rd order intermodulation distortion, IMD3 is measured to be 37.0dBc that is 16.2dB improvement. This shows that TWT amplifier can have better linearity and output power by utilizing AM-PM conversion characteristics.