Title :
A new high-speed periodic-threshold comparator for use in a Josephson A/D converter
Author :
Ko, H. ; Van Duzer, Theodore
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
Abstract :
A Josephson comparator based on a nonhysteric one-junction superconducting quantum interference device (SQUID) for use in a periodic-threshold A/D (analog-to-digital) converter is discussed. Simulations show that a 4-bit A/D converter using this comparator could have a sampling rate of >20 GHz with an analog signal bandwidth of >10 GHz. This performance represents a factor-of-greater-than-five improvement over that of other periodic-threshold A/D converters, which are based on two- or three-junction SQUIDs.<>
Keywords :
Josephson effect; analogue-digital conversion; comparators (circuits); superconducting junction devices; 10 GHz; 20 GHz; 4 bit; ADC; Josephson A/D converter; high-speed; nonhysteric one junction SQUID; periodic limit transducer; periodic-threshold comparator; superconducting quantum interference device; Bandwidth; Circuit simulation; Delay; Frequency conversion; Hysteresis; Interference; Laboratories; SQUIDs; Sampling methods; Superconducting devices;
Journal_Title :
Solid-State Circuits, IEEE Journal of
