Arbitrary drive for magnetic field waveform control

Details Arbitrary drive for magnetic field waveform control Arbitrary drive for magnetic field waveform control

1981-03-02

1983-08-23

Atkinson, Charles E.

Excavating

324210, 365 1, G01R 3128, G11C 2900

Patent

active

044008090

ABSTRACT:
Disclosed is a method and apparatus for digital implementation and closed loop feedback of magnetic field waveforms utilizing three channels of a four channel incrementally programmable voltage source to drive field coils in each of three spatial axes, respectively. A fourth channel is utilized for signal conditioning of an output signal from a magnetic bubble memory undergoing test by injecting inverted noise to maximize the signal-to-noise ratio.

REFERENCES:
patent: 3609528 (1979-09-01), Smith
patent: 4008420 (1977-02-01), Navratil
patent: 4233668 (1980-11-01), Yamaguchi et al.
Chen et al., A Novel Probe Tester for the Characterization of 1 Mbit/cm.sup.2 Bubble Memory Device, J. Appl. Phys., 52 (3), Mar. 1981, pp. 2392-2394.
Hagedorn et al., Magnetic Bubble Testing, IEEE Transactions on Magnetics, vol. MAG-13, No. 5, Sep. 1977, pp. 1364-1369.
Bisset et al., Bubble Memories Demand Unique Test Methods, Electronics, May 10, 1979, pp. 117-122.

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