Signal processing circuit for magnetic bubble memory devices
OwnerTakashi Toyooka, Aoki Hirokazu +2inventors
InventorsTakashi Toyooka, Aoki Hirokazu, Mamoru Sugie, Yutaka Sugita
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Abstract
A signal processing circuit for a magnetic bubble memory device is arranged to set a reference level for determining the level of "1" or "0" of the bubble sensing line signal during a period in which only a read signal corresponding to level "0" appears as the output signal of a differential amplifier of the bubble detector circuit.
Claims3
A signal processing circuit for a magnetic bubble memory device having two bubble sensing elements, comprising:
- a differential amplifier, connected to said two bubble sensing elements, for amplifying a difference between output signals from said two bubble sensing elements;
- a comparator, connected to said differential amplifier, for comparing an output signal from said differential amplifier with a given reference level;
- and
- reference level determining means, connected to said comparator, for changing the reference level during a period in which absence of a bubble is detected by the bubble sensing elements until the output of the comparator changes at a first reference level and for determining a second reference level for bubble read operation on the basis of the first reference level.
A signal processing circuit for a magnetic bubble memory device having two pulse bubble driven type sensing elements, comprising:
- pulse current drive means connected to said sensing elements;
- a differential amplifier, connected to said two bubble sensing elements, for amplifying a difference between output signals from said two bubble sensing elements;
- a comparator, connected to said differential amplifier, for comparing an output signal from said differential amplifier with a predetermined level;
- and
- reference level for determining means, connected to said comparator, for producing a reference level supplied to one of said sensing elements and changing the reference level during a period in which absence of a bubble is detected by the bubble sensing elements until the output of the comparator changes at a first reference level and for determining a second level for bubble read operation on the basis of the first reference level.
Dependencies are inferred from the claim text.