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


Sonnenberg, A.H. and Oomen, I. and Hilgenkamp, H. and Gerritsma, G.J. and Rogalla, H. (2001) Sigma-delta A/D converter in HTS ramp edge technology. IEEE Transactions on Applied Superconductivity, 11 (1). pp. 200-204. ISSN 1051-8223

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Abstract: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
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Copyright:©2001 IEEE
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