DocumentCode :
1236857
Title :
Improvement of a bit error rate measuring system for high-temperature superconducting circuits
Author :
Horibe, Masahiro ; Shimaoka, Kazuhiro ; Tarutani, Yoshinobu ; Tanabe, Keiichi
Author_Institution :
Int. Supercond. Technol. Center, Supercond. Res. Lab., Tokyo, Japan
Volume :
13
Issue :
2
fYear :
2003
fDate :
6/1/2003 12:00:00 AM
Firstpage :
425
Lastpage :
428
Abstract :
We have evaluated and tried to improve the measurement precision of a bit error rate (BER) measuring system for superconducting circuits equipped with a magnetic shield and a cryocooler. A noise model has suggested that the most effective way of improving BER is to reduce the noise figure of the wideband pulse amplifier (WPA). BER measurement using a 3-Gbps, 215-1 pseudo random binary signal showed that by using low-noise WPA (noisefigure=4 dB) a 12.0-mV output voltage is required to obtain a minimum BER of 1.19×10-15 (a 10-7 improvement over the previous system) for a 50 Ω standard microstrip. A BER of a La0.2Yb0.9Ba1.9Cu3Ox/MgO/Au microstrip-line to coplanar-waveguide transition-line converter (MCC) was also measured. It was found that the minimum BER was 4.87×10-13 (a 10-5 improvement over the previous system) when the output voltage was 23.8-mV. However these measured BER values were larger than those expected by the noise model. The cause of the larger measured BER is discussed. A minimum BER of 3.64×10-55 in 14.8-mV output voltage for a 50 Ω standard microstrip was obtained when the cryo-cooler was not operated (without the noise from a cryo-cooler).
Keywords :
coplanar waveguides; error statistics; high-speed integrated circuits; high-temperature superconductors; integrated circuit measurement; magnetic shielding; measurement errors; microstrip transitions; microwave measurement; superconducting device noise; superconducting integrated circuits; superconducting microwave devices; wideband amplifiers; 12.0 mV; 14.8 mV; 3 Gbit/s; 4 dB; 50 ohm; BER measuring system; LNA; La0.2Yb0.9Ba1.9Cu3Ox-MgO-Au; amplifier noise figure reduction; bit error rate measuring system; coplanar waveguide; cryocooler; high-temperature superconducting circuits; low-noise amplifier; magnetic shield; microstrip-line to CPW converter; noise model; wideband pulse amplifier; Bit error rate; High temperature superconductors; Magnetic circuits; Magnetic shielding; Microstrip; Noise figure; Noise measurement; Pulse amplifiers; Superconducting device noise; Voltage;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2003.813887
Filename :
1211632
Link To Document :
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