Static information storage and retrieval – Magnetic bubbles – Rotating field circuits
Patent
1982-09-08
1984-02-07
Moffitt, James W.
Static information storage and retrieval
Magnetic bubbles
Rotating field circuits
G11C 1908
Patent
active
044307292
ABSTRACT:
A series resonant drive circuit for a magnetic bubble memory includes X- and Y-coils arranged orthogonally to each other for generating a rotating magnetic field applied to a magnetic bubble memory chip, resonance capacitors each connected to a corresponding one of the X- and Y-coils for forming a series resonance circuit with the corresponding coil at a frequency of the rotating magnetic field, power supplies each connected to a corresponding one of the resonance circuits, and an inductance device connected in series with both of the resonance circuits and a capacitance device connected between the resonance circuits to compensate a mutual inductance due to the inductive coupling between the X- and Y-coils and a capacitance due to the capacitive coupling between the X- and Y-coils. Further, the temperature coefficient of the capacitance device is selected so that the temperature coefficients of the mutual inductance and capacitance between the coils can be compensated.
REFERENCES:
patent: 3763478 (1973-10-01), Yoshizawa et al.
patent: 4145750 (1979-03-01), Yoshizawa et al.
patent: 4379341 (1983-05-01), Toyooka et al.
Aoki Hirokazu
Sugie Mamoru
Toyooka Takashi
Yoshizawa Shigeru
Hitachi , Ltd.
Moffitt James W.
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