An analysis of the tolerance to crosstalk noise of a pulse width modulation system

  • Authors:

  • D. I.-H. Park;R. D. Love

  • Affiliations:

  • IBM Communication Products Division, Research Triangle Park, North Carolina;IBM Communication Products Division, Research Triangle Park, North Carolina

  • Venue:
  • IBM Journal of Research and Development
  • Year:
  • 1983

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Abstract

This paper reports the results of an investigation to determine the drive degradation caused by random noise in a pulse width modulation (PWM) system originally designed for communicating on coaxial cable but using instead twisted-pair cables. Presented are the analysis of the driver/receiver circuit, the theoretical modeling of the transmitted waveforms over the twisted-pair medium using ASTAP. and a methodology for trading oflrms noise for transmission capability. The analysis of the effect of noise on drive distance as a function of allowable error rate is derived, and an example is provided. Finally, a simplified analysis technique is proposed to allow rapid calculation of approximate (yet conservative) results.