A FPGA-based multi-rate interpolator with real-time rate change for a JET test-bench system

  • Authors:

  • A. J. N. Batista;D. Alves;N. Cruz;J. Sousa;C. A. F. Varandas;E. Joffrin;R. Felton;J. Farthing

  • Affiliations:

  • Associação EURATOM, IST, Centro de Fusão Nuclear, Lisbon, Portugal;Associação EURATOM, IST, Centro de Fusão Nuclear, Lisbon, Portugal;Associação EURATOM, IST, Centro de Fusão Nuclear, Lisbon, Portugal;Associação EURATOM, IST, Centro de Fusão Nuclear, Lisbon, Portugal;Associação EURATOM, IST, Centro de Fusão Nuclear, Lisbon, Portugal;Association EURATOM-CEA, CEA-Cadarache, St Paul-Lez Durance, France;Association UKAEA, Euratom, Culham Science Centre, Abingdon, Oxfordshire, UK;Association UKAEA, Euratom, Culham Science Centre, Abingdon, Oxfordshire, UK

  • Venue:
  • RTC'05 Proceedings of the 14th IEEE-NPSS conference on Real time
  • Year:
  • 2005

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Abstract

Eight independent multi-rate signal interpolators, with real-time change of rate capability, were implemented on a Field Programmable Gate Array. The interpolator main building blocks are a Cascaded Integrator-Comb (CIC) filter and the respective compensation filter. The latter performs a fixed rate change of 4 and was implemented as a 129 taps Finite Impulse Response (FIR) filter. The FIR filter coefficients were attained from the MATLAB® simulation, based on the inverse sinc(x) function. The CIC was designed to have 6 stages (N), a differential delay (M) of 1 and a variable rate change factor (R) ranging from 10 up to 10000. Each interpolator over-samples the multiple data rate digital signals stored at the Joint European Torus (JET) pulse database to a fixed sampling rate of 40 MSPS. These signals are subsequently converted to the analogue domain by 16 bit Digital-to-Analog Converters to be used as stimulus for testing real-time control tools and systems at JET.