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Digital Techniques for Broadband and Linearized Transmitters

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Bandwidth and Efficiency Enhancement in Radio Frequency Power Amplifiers for Wireless Transmitters

Part of the book series: Analog Circuits and Signal Processing ((ACSP))

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Abstract

This chapter presents linearization techniques for multiband and broadband operations on system as well as algorithm levels. The chapter highlights the limitations of the established digital predistortion (DPD) linearization techniques for broadband transmission. To alleviate these limitations of conventional DPD schemes, the hybrid predistortion techniques are presented in detail, which take advantage of best features of “analog” as well as “digital” processing domains. Predistortion techniques rely on accurate characterization of intermodulation distortion (IMD) terms and their precise control can mitigate the nonlinearity in the PA. However, Delta-sigma technique is further presented for high-efficiency switched-mode PA applications, where amplitude is kept constant by converting the signal into pulses to drive the high-efficiency switched-mode PAs. Keeping with the discussion of high efficiency, linearization challenges for multiband envelop tracking application is also presented and various digital techniques are compared in terms of linearization performance.

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Authors and Affiliations

  1. Indian Institute of Technology Roorkee, Roorkee, India

    Karun Rawat

  2. The Ohio State University, Columbus, OH, USA

    Patrick Roblin

  3. Indian Institute of Technology Delhi, New Delhi, India

    Shiban Kishen Koul

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  1. Karun Rawat
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  2. Patrick Roblin
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  3. Shiban Kishen Koul
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Rawat, K., Roblin, P., Koul, S.K. (2020). Digital Techniques for Broadband and Linearized Transmitters. In: Bandwidth and Efficiency Enhancement in Radio Frequency Power Amplifiers for Wireless Transmitters. Analog Circuits and Signal Processing. Springer, Cham. https://doi.org/10.1007/978-3-030-38866-9_5

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  • DOI: https://doi.org/10.1007/978-3-030-38866-9_5

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  • Online ISBN: 978-3-030-38866-9

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