Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/234068
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dc.contributor.authorHai Wangen_US
dc.contributor.authorHua Chenen_US
dc.contributor.authorXiangyan Kongen_US
dc.contributor.authorMeiling Wangen_US
dc.contributor.authorYi Zhangen_US
dc.contributor.authorXiaoming Xieen_US
dc.date.accessioned2013en_US
dc.date.accessioned2020-04-06T08:45:25Z-
dc.date.available2020-04-06T08:45:25Z-
dc.date.issued2017en_US
dc.identifier.other10.1109/TASC.2016.2631430en_US
dc.identifier.urihttp://localhost/handle/Hannan/234068-
dc.description.abstractNoise matching between superconducting quantum interference device (SQUID) sensor and readout electronics has always been an important problem. Conventionally, in order to avoid the hysteresis, SQUIDs should be operated in the range of &x03B2;<sub>c</sub> &lt;; 1, where &x03B2;<sub>c</sub> is the Stewart-McCumber parameter. Recently, Liu et al. extended the SQUID operating area to &x03B2;c &gt; 1 due to a large noise parameter &x0393;*. When &x03B2;<sub>c</sub> &gt; 1, SQUID exhibits a large &x2202;V/&x2202;&x03A6;, which is beneficial in reducing the noise contribution of the readout electronics, &x03B4;&x03A6;<sub>e</sub>. In this work, we compare the SQUID system noise &x03B4;&x03A6;<sub>s</sub> measured with four different readout electronics. Here, the four readout electronics employed are as follows: 1) the flux modulation scheme (FMS); 2) the direct readout scheme (DRS), which uses six parallel connected bipolar transistor as its preamplifier (DRS-PCBT); 3) the DRS, which uses a single preamplifier AD797 (DRS-AD797); and 4) the two-stage scheme. The preamplifier voltage noise of DRS-PCBT and DRS-AD797 are about 0.4 nV/&x221A;Hz and 0.9 nV/&x221A;Hz, respectively. For a two-stage scheme, the equivalent flux noise reaches about 0.25 &x03BC;&x03A6;<sub>0</sub>/&x221A;Hz, the measured SQUID intrinsic noise, &x03B4;&x03A6;<sub>i</sub>, will dominate &x03B4;&x03A6;<sub>s</sub>. In other readout schemes, however, &x03B4;&x03A6;<sub>s</sub> depends on the value of &x03B2;<sub>c</sub>. Finally, we found that FMS is suitable to match SQUIDs with &x03B2;<sub>c</sub> &lt;; 1. DRS-PCBT is a good choice for SQUIDs with 1 &lt;; &x03B2;<sub>c</sub> &lt;; 3 whereas DRS-AD797 suffices for SQUIDs with &x03B2;<sub>c</sub> &gt; 3.en_US
dc.format.extent1,en_US
dc.format.extent4en_US
dc.publisherIEEEen_US
dc.relation.haspart7752813.pdfen_US
dc.titleStudy on Noise Matching Between SQUID Sensor and Its Readout Electronicsen_US
dc.typeArticleen_US
dc.journal.volume27en_US
dc.journal.issue4en_US
Appears in Collections:2017

Files in This Item:
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7752813.pdf530.81 kBAdobe PDF
Full metadata record
DC FieldValueLanguage
dc.contributor.authorHai Wangen_US
dc.contributor.authorHua Chenen_US
dc.contributor.authorXiangyan Kongen_US
dc.contributor.authorMeiling Wangen_US
dc.contributor.authorYi Zhangen_US
dc.contributor.authorXiaoming Xieen_US
dc.date.accessioned2013en_US
dc.date.accessioned2020-04-06T08:45:25Z-
dc.date.available2020-04-06T08:45:25Z-
dc.date.issued2017en_US
dc.identifier.other10.1109/TASC.2016.2631430en_US
dc.identifier.urihttp://localhost/handle/Hannan/234068-
dc.description.abstractNoise matching between superconducting quantum interference device (SQUID) sensor and readout electronics has always been an important problem. Conventionally, in order to avoid the hysteresis, SQUIDs should be operated in the range of &x03B2;<sub>c</sub> &lt;; 1, where &x03B2;<sub>c</sub> is the Stewart-McCumber parameter. Recently, Liu et al. extended the SQUID operating area to &x03B2;c &gt; 1 due to a large noise parameter &x0393;*. When &x03B2;<sub>c</sub> &gt; 1, SQUID exhibits a large &x2202;V/&x2202;&x03A6;, which is beneficial in reducing the noise contribution of the readout electronics, &x03B4;&x03A6;<sub>e</sub>. In this work, we compare the SQUID system noise &x03B4;&x03A6;<sub>s</sub> measured with four different readout electronics. Here, the four readout electronics employed are as follows: 1) the flux modulation scheme (FMS); 2) the direct readout scheme (DRS), which uses six parallel connected bipolar transistor as its preamplifier (DRS-PCBT); 3) the DRS, which uses a single preamplifier AD797 (DRS-AD797); and 4) the two-stage scheme. The preamplifier voltage noise of DRS-PCBT and DRS-AD797 are about 0.4 nV/&x221A;Hz and 0.9 nV/&x221A;Hz, respectively. For a two-stage scheme, the equivalent flux noise reaches about 0.25 &x03BC;&x03A6;<sub>0</sub>/&x221A;Hz, the measured SQUID intrinsic noise, &x03B4;&x03A6;<sub>i</sub>, will dominate &x03B4;&x03A6;<sub>s</sub>. In other readout schemes, however, &x03B4;&x03A6;<sub>s</sub> depends on the value of &x03B2;<sub>c</sub>. Finally, we found that FMS is suitable to match SQUIDs with &x03B2;<sub>c</sub> &lt;; 1. DRS-PCBT is a good choice for SQUIDs with 1 &lt;; &x03B2;<sub>c</sub> &lt;; 3 whereas DRS-AD797 suffices for SQUIDs with &x03B2;<sub>c</sub> &gt; 3.en_US
dc.format.extent1,en_US
dc.format.extent4en_US
dc.publisherIEEEen_US
dc.relation.haspart7752813.pdfen_US
dc.titleStudy on Noise Matching Between SQUID Sensor and Its Readout Electronicsen_US
dc.typeArticleen_US
dc.journal.volume27en_US
dc.journal.issue4en_US
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7752813.pdf530.81 kBAdobe PDF
Full metadata record
DC FieldValueLanguage
dc.contributor.authorHai Wangen_US
dc.contributor.authorHua Chenen_US
dc.contributor.authorXiangyan Kongen_US
dc.contributor.authorMeiling Wangen_US
dc.contributor.authorYi Zhangen_US
dc.contributor.authorXiaoming Xieen_US
dc.date.accessioned2013en_US
dc.date.accessioned2020-04-06T08:45:25Z-
dc.date.available2020-04-06T08:45:25Z-
dc.date.issued2017en_US
dc.identifier.other10.1109/TASC.2016.2631430en_US
dc.identifier.urihttp://localhost/handle/Hannan/234068-
dc.description.abstractNoise matching between superconducting quantum interference device (SQUID) sensor and readout electronics has always been an important problem. Conventionally, in order to avoid the hysteresis, SQUIDs should be operated in the range of &x03B2;<sub>c</sub> &lt;; 1, where &x03B2;<sub>c</sub> is the Stewart-McCumber parameter. Recently, Liu et al. extended the SQUID operating area to &x03B2;c &gt; 1 due to a large noise parameter &x0393;*. When &x03B2;<sub>c</sub> &gt; 1, SQUID exhibits a large &x2202;V/&x2202;&x03A6;, which is beneficial in reducing the noise contribution of the readout electronics, &x03B4;&x03A6;<sub>e</sub>. In this work, we compare the SQUID system noise &x03B4;&x03A6;<sub>s</sub> measured with four different readout electronics. Here, the four readout electronics employed are as follows: 1) the flux modulation scheme (FMS); 2) the direct readout scheme (DRS), which uses six parallel connected bipolar transistor as its preamplifier (DRS-PCBT); 3) the DRS, which uses a single preamplifier AD797 (DRS-AD797); and 4) the two-stage scheme. The preamplifier voltage noise of DRS-PCBT and DRS-AD797 are about 0.4 nV/&x221A;Hz and 0.9 nV/&x221A;Hz, respectively. For a two-stage scheme, the equivalent flux noise reaches about 0.25 &x03BC;&x03A6;<sub>0</sub>/&x221A;Hz, the measured SQUID intrinsic noise, &x03B4;&x03A6;<sub>i</sub>, will dominate &x03B4;&x03A6;<sub>s</sub>. In other readout schemes, however, &x03B4;&x03A6;<sub>s</sub> depends on the value of &x03B2;<sub>c</sub>. Finally, we found that FMS is suitable to match SQUIDs with &x03B2;<sub>c</sub> &lt;; 1. DRS-PCBT is a good choice for SQUIDs with 1 &lt;; &x03B2;<sub>c</sub> &lt;; 3 whereas DRS-AD797 suffices for SQUIDs with &x03B2;<sub>c</sub> &gt; 3.en_US
dc.format.extent1,en_US
dc.format.extent4en_US
dc.publisherIEEEen_US
dc.relation.haspart7752813.pdfen_US
dc.titleStudy on Noise Matching Between SQUID Sensor and Its Readout Electronicsen_US
dc.typeArticleen_US
dc.journal.volume27en_US
dc.journal.issue4en_US
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7752813.pdf530.81 kBAdobe PDF