Sigma-delta A/D converter in HTS ramp edge technology

A.H. Sonnenberg, I. Oomen, Johannes W.M. Hilgenkamp, G.J. Gerritsma, Horst Rogalla

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We have successfully fabricated and tested a high temperature superconducting sigma-delta A/D converter, The quantizer is a balanced comparator that has been characterized separately in two temperature regimes. The circuits have been fabricated with ramp edge junctions with a PrBaCuCaO-barrier on a buried ground plane. For the current to voltage conversion in the sigma-delta converter we fabricated a 50 mOhm resistor with an in-situ gold layer, The sigma-delta converter has been tested at an internal clock of up to 174 GHz. The signal-to-noise ratio has been measured at a relatively low frequency of 3.4 kHz and was at least 63 dB but most likely higher since the measurement was limited by the noise in the amplifiers, As a first attempt towards the development of a decimation filter we have fabricated and tested a toggle flip-flop. The toggle flip-flop has been tested successfully at 40 K up to a frequency of 33 GHz, which corresponds to 70% of the IcRn-product of a reference junction
Original languageUndefined
Pages (from-to)200-204
Number of pages5
JournalIEEE transactions on applied superconductivity
Issue number1
Publication statusPublished - 2001


  • IR-36054
  • METIS-200484

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