Rockwell International Corporation

Thomas T Chen

Isoris S Gergis

John L Archer

John E Ypma

Leonard Tocci

Ronald G Wolfshagen

Glen W Murray

Cigar humidifier

A coil arrangement for testing magnetically operative devices comprising means for mounting a magnetically operative device to be tested by an external magnetic field; first and second coil means disposed symmetrically with respect to the place of the device, the coil means functioning to produce an external magnetic field for testing the device; characterized in that the first coil means is embedded within a metallic electrically conductive body for confining the magnetic field lines to a predetermined region.

Copper embedded ferrite coil arrangement for supplying uniform rotating

A magnetic bubble domain circuit which permits the information in two separate propagation paths to crossover each other without deleterious effects. The crossover junction includes at least two definable propagation paths, a merge device for joining the paths, and an active transfer junction between the two paths. The information on the two paths is arranged to become interleaved or intermixed at the merge and to be separated at the active transfer switch arrangements are made for crossing over a plurality of propagation paths by using information properly timed or spaced, or, in the alternative, using a multiple junction arrangement.

Crossover junction for magnetic bubble domain circuits

There is shown and described a magnetic bubble domain device organization using certain propagation elements which have expanded size relative to the remainder of the propagation elements in order to improve device or system operation.

Magnetic bubble domain organization using double period input/output

There is shown and described a magnetic bubble domain decoder organization which is especially adaptable to a single port configuration. A plurality of separate storage loops are utilized to store data in the form of magnetic bubble domains. An input/output section is provided for supplying data to the storage loops. A crossover junction circuit permits information to be propagated along a single input/output loop into and out of the storage loops. Input and output decoder circuits are provided in each storage loop to control the data which is stored therein. Control circuits such as tranfer switches, universal switches, retarding networks and the like are arranged to control the movement of magnetic bubble domains in the storage loops. By operation of the various control circuits, interwoven data in the storage loops can be selectively separated and retrieved at the input/output section.

Magnetic bubble domain decoder organization

A magnetic bubble domain circuit component for selectively, substantially concurrently, exchanging bubble domains from adjacent propagation paths. The exchange switch defined herein is an active (i.e. a control current is required) switch. The improved design of the exchange switch permits bubble domain exchanges in a minimum time and distance in a magnetic bubble domain circuit.

Compact exchange switch for bubble domain devices

There is disclosed an apparatus and method for constructing integrated buffered devices for use with magnetic bubble domain memories. A small storage loop acts as the buffer memory and is interfaced with the main storage loops through a new circuit component. The new circuit component performs the function of transferring a bubble from one track, holds the bubble for a prescribed number of cycles, and then transfers the bubble to another track. Thus, any arbitrarily located bubble within the storage loop can be transferred to any arbitrary location in the buffer loop.

Magnetic bubble domain memory device with integrated buffer

There is provided an improved switching arrangement for controlling the interaction of magnetic bubble domain propagation loops in order to provide a large, serial storage loop which is fault tolerant and has improved operating characteristics. The switch provides on-chip correction capability and, as well, enhanced switching capability to render defective loops or propagation path portions separable in a positive manner.

Switch for fault tolerant bubble domain memory systems

The disclosed chip design is directed to a multiplexed decoder chip with M.gtoreq.2. With this arrangement magnetic bubble domains are propagating at one data bit every M cycles (for M = 2 this is every other cycle). Therefore, a unique decoder network using an existing retarding switch can be realized to offer a lower power, highly efficient multiplexed decoder chip with complete selective read-write capability.

Bubble domain circuit organization

There is described a magnetic bubble domain device particularly adapted for bubble domain detection. A bubble is supplied via a standard input propagation path, expanded to an elongated bubble comfiguration and replicated into a plurality of bubbles. The plurality of bubbles propagate along a respective plurality of propagation paths and reach a detector portion, preferrably at different times. The detector portion is arranged to receive bubbles along the respective plurality of paths and to produce enlarged bubbles representative of each of the bubbles replicated from the original bubble. Consequently, the original bubble has been enlarged by elongation and by replication wherein detection of the original bubble is enhanced.

Two dimensional stretcher detector

A unique and compact open coil rotating magnetic field network structure to efficiently package an array of bubble domain devices is disclosed. The field network has a configuration which effectively enables selected bubble domain devices from the array to be driven in a vertical magnetic field and in an independent and uniform horizontal rotating magnetic field. The field network is suitably adapted to minimize undesirable inductance effects, improve capabilities of heat dissipation, and facilitate repair or replacement of a bubble device.

Uniform rotating field network structure to efficiently package a

This invention relates to an improved network and technique for correcting bubble domain memories of the major/minor loop type. In particular, a selectively insertable correction loop can be provided in a major loop path to insert or remove blank bits so that the effect of defective minor loops can be overcome. The correction networks include propagation loops formed of conventional magnetic bubble domain device elements and a conductor which is selectively alterable to provide a bypass or insertion mode of operation for the correction loop relative to the major loop.

Multiple redundancy loop bubble domain memory

A switch device which is disposed between adjacent magnetic bubble domain propagation paths to permit selective, substantially concurrent, exchange of information (i.e. magnetic bubble domains) from one path to the other. The switch is a unique arrangement of substantially conventional components which are selectively activated by application of a current through a control conductor. In one condition, the magnetic bubble domains propagate through the respective paths in the normal manner. In another condition, as a function of the control current supplied to the conductor, the bubbles are exchanged (simultaneously transferred) between the respective paths. In yet another condition, the bubbles in one path are replicated and supplied to another path.

Magnetic bubble data transfer switch

A single, compact bias structure to efficiently package a plurality of magnetic bubble domain device chips having different bias requirements. The vertical magnetic field distribution within the bias structure air gap is selectively controlled by a magnetically soft field adjusting assembly suitably attached within the bias structure. The size and configuration of the field adjusting assembly tailors local field variations within the air gap to correspond with the bias requirements of the bubble domain chips disposed therein.

Bias structure to efficiently package a magnetic bubble domain device

An on-chip bubble domain circuit organization utilizing a multi-chip concept is provided. One or more storage registers are separately connected to each of a plurality of propagation channels whereby data in the form of magnetic bubble domains (bubbles) may be transferred into and out of the storage registers. Each of the propagation channels includes a generator for producing the initial bubbles which are supplied to a multiple output replicator via an input propagation path. The initial bubbles are replicated into any desired number of new bubbles by a multiple output replicator. The input propagation paths for the several channels have different lengths of propagation times between the generator and the replicator. Input decoders are utilized to determine to which storage register the bubbles from the replicators will be directed along the propagation channel. Those bubbles not selected are, typically, annihilated. Output decoders utilizing essentially the same decoding scheme as the input decoders, selectively received bubbles from the storage registers. A transfer and replicate switch is utilized between the storage register and output decoders to selectively transfer bubbles to the output decoders. The output decoders may collapse all of the bubbles from certain storage registers so that only the information from the selected storage register reaches the detector. Moreover, the output decoders have different path lengths to the detectors, as a function of the input propagation path, so that each channel has the same propagation time from generator to detector. The detectors in turn produce the chip output signals. External control electronics are utilized to control the selective operation of the various devices utilized in the propagation channels.

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Yorba Linda, CA, United States of America

Thomas T Chen