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Integrated magnetometer with a digital output

Conference · · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)
OSTI ID:6090132
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  1. Univ. Karlsruhe, Institut fur Elektrotechnische Grundlagen der Informatik, Hertzstr. 16, D-7500 Karlsruhe 21 (DE)
This paper reports on a magnetometer with a 50 mm{sup 2} pickup coil, a sensor SQUID, a flux transformer and a 1 bit A/D-converter integrated on a single 6 {times} 12 mm{sup 2} Silicon chip in the Nb-Nb{sub x}O{sub y}-PbInAu technology. The pickup coil has a single turn with a 25 {mu}m wide Nb strip. Operated in a flux-locked loop and a clock frequency of 18.4 MHz, the achieved flux noise and magnetic field sensitivity are 3.5 {mu}{phi}{sub 0}/square root of Hz and 8.5 fT/square root of Hz at 1.5 Hz. With a digital feedback of constant step size a maximum slew rate of 11 500{phi}{sub 0}/s has been measured. Below the maximum slew rate the linearity between input and output has been investigated.
OSTI ID:
6090132
Report Number(s):
CONF-900944--
Conference Information:
Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 27:2
Country of Publication:
United States
Language:
English