发明名称 |
AC BIASING OF A DC SQUID |
摘要 |
<p>A circuit for reducing low frequency noise in a direct current biased superconducting quantum interference device. A squarewave bias signal having no dc component is used to bias the two junctions of the dc SQUID. At the same time, the magnetic flux in the SQUID is modulated to heterodyne the input signals up to some convenient frequency where they may be amplified without concern for drift. Final demodulation automatically adjusts for the fact that the relative phase is reversed each time the squarewave bias changes polarity states.</p> |
申请公布号 |
EP0053625(B1) |
申请公布日期 |
1987.09.02 |
申请号 |
EP19810901786 |
申请日期 |
1981.06.11 |
申请人 |
S.H.E. CORPORATION |
发明人 |
SIMMONDS, MICHAEL BANCROFT;GIFFARD, ROBIN PETER |
分类号 |
G01R19/00;G01R33/035;(IPC1-7):G01R33/02 |
主分类号 |
G01R19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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