Title :
An experimental digital SQUID with large dynamic range and low noise
Author :
Perng-Fei Yuh ; Rylov, S.V.
Author_Institution :
HYPRES Inc., Elmsford, NY, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
A digital SQUID chip designed for large dynamic range and intrinsic sensitivity as good as an analog SQUID was fabricated and tested. It consists of a pickup coil, a SQUID amplifier, edge-triggered latching comparators, and a feedback loop using an integrating single-flux-quantum D/A converter. Proper operation of the chip was demonstrated, with the output one-bit data stream averaged and integrated to reconstruct the input signal. A sampling rate up to 500 MHz was achieved.<>
Keywords :
SQUIDs; circuit feedback; delta modulation; signal reconstruction; signal sampling; superconducting device noise; superconducting logic circuits; 500 MHz; SQUID amplifier; digital SQUID chip; edge-triggered latching comparators; feedback loop; input signal reconstruction; integrating single-flux-quantum D/A converter; intrinsic sensitivity; large dynamic range; low noise; output one-bit data stream averaging; oversampling delta modulation; pickup coil; sampling rate; slew rate limited chip; Circuits; Clocks; Dynamic range; Feedback loop; Pulse inverters; Pulse transformers; SQUIDs; Superconducting coils; Superconducting device noise; Superconducting transmission lines;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
