On FM demodulators in software defined radios using FPGAs

  • Authors:

  • Michael Rice;Marc Padilla;Brent Nelson

  • Affiliations:

  • NSF Center for High-Performance Reconfigurable Computing, Department of Electrical & Computer Engineering, Brigham Young University, Provo, Utah;NSF Center for High-Performance Reconfigurable Computing, Department of Electrical & Computer Engineering, Brigham Young University, Provo, Utah;NSF Center for High-Performance Reconfigurable Computing, Department of Electrical & Computer Engineering, Brigham Young University, Provo, Utah

  • Venue:
  • MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
  • Year:
  • 2009

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Abstract

The use FPGAs to implement sampled-data FM demodulators for software-defined radios that must support "legacy waveforms" is explored and analyzed. Feed-forward and feedback structures are examined. The best feed-forward structure, in terms of the time/area trade-off, is the arctangent-differentiator structure. The arctangent-differentiator and PLL demodulators have approximately the same time/area product and approximately the same SNR performance. However, the two occupy very different locations in the time/area trade-off space. Relative to the PLL demodulator, the feed-forward demodulator can achieve a much higher clock rate, but requires more area.