An Intrinsically Linear Wideband Polar Digital Power Amplifier

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10 Citations (Scopus)

Abstract

This paper presents an intrinsically linear wideband polar digital power amplifier (DPA) operating in semi class-E/F2 mode. Without using any type of digital pre-distortion (DPD), the proposed architecture achieves high linearity by accurately controlling its AM-AM and AM-PM characteristic curves through nonlinear sizing, overdrive-voltage control, and multiphase RF clocking without compromising the achievable output power or efficiency. Measurement results of the fabricated prototype in 40-nm bulk CMOS show -46 and -40 dBc adjacent channel power ratio (ACPR) for 20and 40-MHz orthogonal frequency-division multiplexing (OFDM) signals, respectively. The measured error vector magnitudes (EVM) are -36 dB and -33 dB, respectively. Measured results indicate a PSAT, peak drain efficiency (DE), and power-added efficiency (PAE) of 14.6 dBm, 44%, and 26%, respectively, using a 0.5-V supply for the output stage at 2.2 GHz.
Original languageEnglish
Pages (from-to)3312 – 3328
Number of pages17
JournalIEEE Journal of Solid-State Circuits
Volume52
Issue number12
DOIs
Publication statusPublished - 2017

Keywords

  • Class-E/F2
  • digital power amplifier (DPA)
  • digital pre-distortion (DPD)-less
  • efficient
  • linear
  • multiphase RF clocking
  • nonlinear sizing
  • overdrive-voltage control
  • wideband

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