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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Drung, D. Cantor, R. Peters, M. Ryhanen, T. Koch, H. |
| Copyright Year | 1965 |
| Abstract | A directly coupled DC SQUID magnetometer with very simple feedback electronics is presented. The magnetometer has been integrated on a 7.2*7.2 mm/sup 2/ chip and fabricated using a four-level Nb/Si/sub x/N/sub y//Nb process. Eight pickup loops are connected in parallel to directly form the SQUID inductance of about 0.4 nH which leads to a high sensitivity B/ Phi =0.47 nT/ Phi /sub 0/. An additional positive feedback (APF) circuit on the magnetometer chip has been used to increase the gradient of the V- Phi characteristic to dV/d Phi approximately=300 mu V/ Phi /sub 0/ at the SQUID operating point. The resulting gradient of the transfer function dV/dB approximately=640 mu V/nT makes it possible to directly readout the SQUID without helium-temperature impedance matching circuits or flux modulation techniques. Using a highly simplified feedback electronics consisting of an ultra-low-noise bipolar preamplifier and an integrator on a 10-cm/sup 2/ PC board, a white noise level below 3 fT/ square root Hz with a 1/f corner frequency around 3 Hz, a 3-dB bandwidth of about 40 kHz, and a maximum feedback range of +or-32 nT for frequencies up to 300 Hz have been measured. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 3001 |
| Ending Page | 3004 |
| Page Count | 4 |
| File Size | 770546 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 27 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1991-03-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | SQUID magnetometers Niobium Frequency Couplings Inductance Magnetic circuits Feedback circuits Transfer functions Impedance matching Preamplifiers |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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