Title :
Speed-limiting factors in flash-type Josephson A/D converters
Author :
Fang, Emerson S. ; Duzer, Theodore Van
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors discuss the causes of speed limitations in various A/D (analog/digital) converter designs. The upper limit on bandwidth is extracted with the help of Josephson SPICE simulations. In the Josephson A/D converter circuits discussed, the dynamic properties of the SQUIDs (superconducting quantum interference devices) determine the aperture time and dictate the bandwidth. Designs for 4-bit A/D converters that show potential for bandwidths on the order of 10 GHz are described. Particular attention is given to the bit-parallel A/D converter with self-gating AND comparator and bit-parallel A/D converters with CLAM (current latching analog microcomparator) and variable-pulse peak comparators
Keywords :
SQUIDs; analogue-digital conversion; integrated circuit technology; superconducting junction devices; 10 GHz; ADC; CLAM; Josephson A/D converter circuits; Josephson SPICE simulations; SQUIDs; aperture time; bit-parallel A/D converter; causes of speed limitations; current latching analog microcomparator; dynamic properties; flash-type Josephson A/D converters; self-gating AND comparator; speed limiting factors; superconducting quantum interference devices; upper limit on bandwidth; variable-pulse peak comparators; Artificial intelligence; Bandwidth; Circuit simulation; Large Hadron Collider; Linearity; Quantization; SPICE; Sampling methods; Signal mapping;
Journal_Title :
Magnetics, IEEE Transactions on
