Fast and accurate behavioral simulation of fractional-N frequency synthesizers and other PLL/DLL circuits

  • Authors:
  • Michael H. Perrott

  • Affiliations:
  • MIT

  • Venue:
  • Proceedings of the 39th annual Design Automation Conference
  • Year:
  • 2002

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Abstract

Techniques for fast and accurate simulation of fractional-N synthesizers at a detailed behavioral level are presented. The techniques allow a uniform time step to be used for the simulator, and can be applied to a variety of phase locked loop (PLL) and delay locked loop (DLL) circuits beyond fractional-N synthesizers, as well as to a variety of simulation frameworks such as Verilog and Matlab. Simulated results from a custom C++ simulator are shown to compare well to measured results from a prototype fractional-N synthesizer using a &Sgr; modulator to dither its divide value.