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A novel wideband active feedback amplifier linearization scheme suitable for handsets

Research output: Contribution to conferenceAbstract

Original languageEnglish
Pages1712 - 1716
StatePublished - May 2000


A new active feedback network is proposed for reducing intermodulation distortion (IMD). It is based on using the existing second harmonic zone (SHZ) distortion energy generated by the amplifier to predistort the input signals optimally to obtain a linear output. The technique is analyzed theoretically and practical results demonstrate the linearization performance. The measured two-tone test showed 23-dB reduction in the third-order intermodulation products (IMP3), where π/4 DQPSK and W-CDMA gave up to 15-dB and 13-dB adjacent channel interference (ACI) suppression respectively. This technique differs from available active feedback techniques by performing both with narrow and wideband modulated signals. The linearization circuitry is simple and small in size.

Additional information

Sponsorship: The authors would like to acknowledge the Center for Communications Research (CCR), University of Bristol for the provision of laboratory facilities and thank Lucent Technologies for their financial support. Terms of use: Copyright © 2000 IEEE. Reprinted from Proceedings of IEEE Vehicular Technology Conference Proceedings, 2000. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Name of Conference: 51st Vehicular Technology Conference 2000 (VTC 2000-Spring) Venue of Conference: Tokyo, Japan

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