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Verification of practicality of using the second harmonic for reducing IMD

Verification of practicality of using the second harmonic for reducing IMD

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An experimental investigation into the practicality of using the inter-stage second harmonic for reducing third-order intermodulation distortion (IMD) is reported. Experimental results show that the technique is inherently stable and that a reduction of 20 dB in the third-order IMD is obtainable.

Inspec keywords: circuit stability; power amplifiers; intermodulation distortion; feedforward; linearisation techniques

Other keywords: third-order IMD reduction; linearised power amplifiers; inter-stage second harmonic; intermodulation distortion

Subjects: Amplifiers

References

    1. 1)
      • Jing, D., Chan, W.S., Li, C.W.: `Spectral regrowth of digital signal throughan amplifier and a new linearity method', APMC Proceedings, December 1997, Hong Kong SAR, PRC, p. 525–528.
    2. 2)
      • Moazzam, M.R., Aitchison, C.S.: `A low third order intermodulationamplifier with harmonic feedback circuitry', IEEE MTT-S Int. Microwave Symp. Dig., June 1996, San Francisco, CA, p. 827–830.
    3. 3)
      • T.T. Ha . (1991) Solid state microwave amplifier design.
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