Static information storage and retrieval – Read/write circuit – Differential sensing
Patent
1977-05-02
1979-01-02
Moffitt, James W.
Static information storage and retrieval
Read/write circuit
Differential sensing
365 69, 365129, 365193, 365196, G11C 11063
Patent
active
041330501
ABSTRACT:
A large bit size core memory which maximizes usable flux includes at least one array of low drive toroidal magnetic memory cores, a sense-inhibit conductor pair passing through the array in a given direction to inductively couple all cores in the array, a plurality of perpendicular drive conductors, each passing through the array perpendicular to the sense-inhibit conductor pair and inductively coupling a portion of the cores in the array, a plurality of parallel drive conductors, each passing through the array parallel to the sense-inhibit conductor pair and inductively coupling a portion of the cores in the array, and driving and switching circuitry coupled to drive selected a core during a read portion of a memory cycle with a current which rapidly increases to approximately provide the coercive force MMF to the core and then increases relatively slowly toward the full drive current. The resulting core output switching pulse received by a strobed sense amplifier has an early noise component from delta noise and coupling noise and a subsequent logic 1 switching pulse which is extremely stable with respect to normal variations in temperature and drive current, which has a flat, low magnitude peak that satisfies sense amplifier requirements and which is sufficiently delayed to permit attenuation of the noise signals.
REFERENCES:
patent: 3513454 (1970-05-01), Ogrodski
patent: 3905026 (1975-09-01), Sell
Ampex Corporation
Moffitt James W.
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