| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a device structure wherein the magnetic flux generated by a supplied bias current does not exert adverse effect on other elements integrated on the same board, in a superconducting quantum interference device(SQUID) of high sensivity and low noise which detects fine magnetic field, current, voltage, electromagnetic wave, etc. SOLUTION: A bias wiring layer 4 for applying a bias current to a DC-SQUID is formed and arranged on the upper layer or the lower layer of a superconducting ring of the DC-SQUID. Wiring is so formed that the bias wiring layer 4 passes a symmetrical axis which divides the superconducting ring into two halves. By arranging the bias wiring layer 4, generation of magnetic flux which is caused by the bias current can be restrained. Since interference due to the bias current is not generated on the DC-SQUID itself its peripheral part, adverse influence is not exerted on elements integrated on the same board. Especially in an SQUID array, phases of magnetic flux-voltage characteristics of the respective constituent DC-SQUID's are easily conformed, and it largely contributes to enlargement of a modulation voltage.</p> |
