Phase correcting drive circuit for a magnetic bubble field-access memory
US3972037A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1975 |
| Grant date | Jul 27, 1976 |
| Priority date | — |
| Expiry date | Jun 30, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/085
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.