Multiplexing Techniques of Single Flux Quantum Circuit Based Readout Circuit for a Multi-Channel Sensing System

Time division multiplexing (TDM) and code division multiplexing (CDM) have been investigated for multichannel superconductive sensing systems using single-flux-quantum (SFQ) readout circuits. Output data from a superconductive sensor array can be multiplexed using SFQ binary counters, which count th...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.2500204-2500204
Main Authors: Aoki, K., Yamanashi, Y., Yoshikawa, N.
Format: Article
Language:English
Subjects:
Analog circuits
Applied sciences
Arrays
Channels
Circuit design
Circuit properties
Circuits
Code division multiplexing (CDM)
Design. Technologies. Operation analysis. Testing
Detection
Digital circuits
digital superconducting quantum interference device (SQUID)
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Integrated circuits
Magnetic flux
Multiplexing
Product introduction
Radiation detectors
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensors
single flux quantum circuit
Slew rate
SQUIDs
superconductive sensor
Superconductors
Theoretical study. Circuits analysis and design
Time division multiplexing
time division multiplexing (TDM)
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Summary:Time division multiplexing (TDM) and code division multiplexing (CDM) have been investigated for multichannel superconductive sensing systems using single-flux-quantum (SFQ) readout circuits. Output data from a superconductive sensor array can be multiplexed using SFQ binary counters, which count the number of SFQ pulses from each sensor, and are transmitted from a low-temperature environment to a room-temperature equipment using a small number of lines. We have estimated and compared the performance of a multichannel superconductive sensing system that employs TDM and CDM on the basis of analog circuit simulation and circuit design results. TDM is useful for reducing the number of lines, but the slew rate of the sensing system decreases with an increase in the number of channels. On the other hand, in the case of CDM, the slew rate of the system does not decrease with an increase in the number of channels. We have designed and tested a 2-channel digital superconducting quantum interference device system that can perform TDM and CDM employing SFQ up/down binary counters. In both circuits, the 16 Φ 0 input waveforms were reconstructed from the measured data, with an error of less than the flux quantum Φ 0 .
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2012.2230679