TY - JOUR
AU1 - Luong, Howard C.
AB - This paper presents the progress we have made on our design, fabrication, and testing of a fully parallel superconducting analog-to-digital converter (ADC) with multi-GHz clock frequencies and input bandwidth. To our best knowledge, this converter is the first flash-type analog-to-digital converter ever reported in Josephson technology that fully integrates a quantizer and a thermometer-to-binary encoder to achieve binary outputs. In this design, the quantizer consists of 2(superscript N-1 comparators, each of which is realized using a hysteretic one- junction sampling SQUID driving a two-junction readout SQUID. A new logic family has been designed based on the same comparator building block and has been used to implement the thermometer-to- binary encoder. Taking advantage of the fact that the encoder's input is thermometer-coded, we have designed three-input and four-input quasi-XOR gates with only three NAND gates and therefore reduced significantly the total gate count. Functionalities of all the sub-circuits have been verified experimentally at clock frequencies up to 3 GHz, which is limited by our currently available testing equipment.
TI - Multigigahertz performance of a superconducting analog-to-digital converter
JF - Proceedings of SPIE
DO - 10.1117/12.181009
DA - 1994-07-02
UR - https://www.deepdyve.com/lp/spie/multigigahertz-performance-of-a-superconducting-analog-to-digital-sQQ1pQed1h
SP - 248
EP - 258
VL - 2160
IS - 1
DP - DeepDyve
ER -