Title: Serial arithmetic functions with magnetic bubble logic elements

Abstract: Compact arrangements of two-input magnetic bubble logic gates providing bubble devices for performing serial integer arithmetic on binary integers are disclosed. Using only a small number of different types of logic gates, designs are given for devices for performing serial addition, subtraction, multiplication and division arithmetic operations on binary integers, represented as sequences of magnetic bubbles. All logical interactions use bubble repulsion to prevent bubbles from transferring to adjacent propagation paths via preferred transitions. By using only two-input gates and a pipeline computational structure, hardware design is simplified and advantage is taken of the inherent serial nature of bubble technology. The simple gate interconnection geometry has a minimum of feedback paths and results in devices which are not burdened with excessive numbers of bubble generators, annihilators or crossovers.

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Inventors: Williams, Richard P. (Columbia, MD, US)

Application Number: 878207
Filing Date: 1978-02-16
Publication_date: 1979-07-10
Assignee: The United States of America as represented by the Director of the (Washington, DC)
Primary Class(es): 708/192 365/5
Other Classes:
US Patent Ref:

3678287	Jul, 1972	Chow	365/5.
3750106	Jul, 1973	Caron	364/900.
3798607	Mar, 1974	Minnick et al.	364/200.
3894223	Jul, 1975	Majima et al.	364/714.
3983383	Sep, 1976	Naden	364/714.
3986016	Oct, 1976	Linn et al.	364/714.
4011461	Mar, 1977	Chang et al.	365/5.

Other Refs:
Primary Examiner: Smith, Jerry
Assistant Examiner:
Attorney: Utermohle; John R., Young; Barry N.