Phase correcting drive circuit for a magnetic bubble field-acces

Details Phase correcting drive circuit for a magnetic bubble field-acces Phase correcting drive circuit for a magnetic bubble field-acces

1975-06-30

1976-07-27

Moffitt, James W.

Communications: electrical

Digital comparator systems

340174GA, G11C 1114

Patent

active

039720373

ABSTRACT:
A feedback loop coupled to a tuned circuit applies to an input of a comparator circuit arrangement a control voltage signal which is a function of the instantaneous current in the tuned circuit. The loop is employed to adjust the timing at which the comparator arrangement applies voltage-refresh pulses to the tuned circuit in response to a reference voltage signal supplied by an external clock. The timing at which the pulses occur is such that the current in the tuned circuit remains in phase with the reference voltage signal. Two like tuned circuits driven 90.degree. out of phase provide the rotating magnetic field characteristic of magnetic bubble, field-access memories.

REFERENCES:
patent: 3720883 (1973-03-01), Hess, Jr. et al.
patent: 3866145 (1975-02-01), Hess, Jr. et al.

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