CA1101544A - Bubble memory vector shift - Google Patents
Bubble memory vector shiftInfo
- Publication number
- CA1101544A CA1101544A CA267,058A CA267058A CA1101544A CA 1101544 A CA1101544 A CA 1101544A CA 267058 A CA267058 A CA 267058A CA 1101544 A CA1101544 A CA 1101544A
- Authority
- CA
- Canada
- Prior art keywords
- bubble
- track
- transfer
- loop
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
- G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
- G11C19/085—Generating magnetic fields therefor, e.g. uniform magnetic field for magnetic domain stabilisation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
- G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
- G11C19/0875—Organisation of a plurality of magnetic shift registers
- G11C19/0883—Means for switching magnetic domains from one path into another path, i.e. transfer switches, swap gates or decoders
Landscapes
- Thin Magnetic Films (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Mram Or Spin Memory Techniques (AREA)
Abstract
Abstract A bubble memory device has a minor loop bubble track, a major loop bubble track and a transfer bubble track comprising permalloy patterns in the same plane. An external field device propagates the bubbles in the loop bubble tracks. The transfer bubble track comprising an elongated permalloy pattern having one end adjacent to a normal positional location of a bubble in the minor loop bubble track and its other end adjacent to a normal positional location of a bubble in the major loop bubble track. An in-plane continuously rotating field generates a first plurality of field vectors having different directions of effective fields in the plane of the permalloy patterns which propagates the bubbles around the major and minor loop bubble tracks. A control mechanism generating a transfer field vector in the plane of the permalloy patterns for diverting bubbles in one of the loop tracks through the transfer track to the other of the loop tracks. The arrange-ment eliminates the need for a transfer conductor and hence makes the device simpler and cheaper than prior devices.
Description
5~
BACKGROUND OF THE INVENTION
Fie~ld of the Invention This invention relates in general to the field o~
magnetic bubble devices and in particular to the Eield of techniques for propagating bubbles in such magnetic devices.
Description_of the Prior Art In the best known prior art, which is exemplified by patents U.S. 3,714,639 and U.S. 3,896,421, for example, various transfer conductor techniques employing separate conductive transfer layers are utiliæed in order to transfer bit information from a ma~or to a minor loop and vise versa.
As can be well appreciated, the utilization of such a separate transfer conductor represents a complication in the overall bubble device circuitry and method of manufacture. Prior art devices employing separate transfer conductor layers require additional electronic circuitry to both energize it selectively and at the required time. Transfer conductors utilized in the prior art devices represents additional manufactoring steps, which normally comprises depositing a layer of Al-4% Cu, i.e.
aluminum with 4% copper, or Au upon a T-bar permalloy pattern.
These metallic layers then have to be patterned in the desired ~ ;
shape by using standard photolithography and chemical etching.
The width of the transfer conductors and bubble tracks are a few `~
microns, thus, it is very diffic~lt to manufacture several layers one on top of the other and maintain exact registration when employing conventional~ mask aligning techniques.
Bubble memory devices are known which have a portion of the major loop track in a common path with the minor loop ;
track. By applying a forward or reverse sequence to the in-plane field bubbles at the common junction may be diverted into one loop or the other. This structure requires complex : `
. .
5~4 circuitry and results in slow transfer.
From the above description it can be readily seen that the fabrication and utilization of the transfer conductor in a magnetic bubble device represents a complex arrangement for a magnetic bubble device. Accordingly, it is an object of this invention to provide a bubble memory that eliminates the transfer conductor so that a bubble device is simpler and more economical to build.
SUMMARY OF THE INVENTION
There is disclosed herein a magnetic bubble circuit arrangement consisting of major and minor loop tracks~ Shifting of bubbles between the major and minor loop tracks is accomplished without the use of prior art type transfer conductors by utilizing strong 45 and 135 Eield vectors and a sequencing or rotating field. These field vectors are utilized to provide a strong magnetic field at the transfer locations as the rotating field traverses a 360 rotation when it is desired to transfer into or out of the minor loops.
More specifically, the invention consists of a bubble memory which transfers bubbles by means of a continuous rotating in-plane field transfer conductor member comprising: (a) an arrangement of magnetic elements to form a major recirculating channel; (b) at least one arrangement of magnetic elements to form a minor recirculating channel; (c) means coupling the major channel with the minor channel and vice versa; (d) said bubbles being propagated around said major channel and into and out of said minor channels by means of the in-plane rotat-ing field bit without said transfer member.
,.~ -BRIEF DESCRIPTION OF THE DRAWINGS
Figure l depicts the major and minor loop track circuitry utilized in the instant inventlon.
Figure 2 shows another arrangement of transfer elements of the major and minor loop tracks.
Figure 3 depicts the arrangement for obtaining the 45 and 135 vectors.
Figure 3e depicts the rotating field vector utili~ed in this invention.
Figure 4 shows in block form the circuit arrangement -for energizing the orthogonal coil pairs.
DESCRXPTION OF THE PREFERRED EMBODIMENT
Referring now to Figure 1, there is depicted the .
15~
magrle~lc bubble circ-lit utilized in this invention and composed oE a major loop pattern or track LM and a minor loop pattern or track LI formed on a permalloy garnet semiconductor material in ~hich sing1e wall domains can be moved. The major loop LM is shown partially populated and is comprised of the NiFe T-bar elements 6, 8, 10, 12, 14, 16, 18, 20 and 22. The minor loop LI is composed of the NiFe elements 15, 19, 21, 23, 75, 27, 29, 31, 33, 35, 37, 39, 41, 43, 17 and 26. Associated with the bubble circuit is a rotating magnetic field. This rotating magnetic field is represented by the field vector arrangement shown in Figure 3e. It should be noted that field vectors 1, 2, 3 and 4 have the identical magnitude of current I in the directions represented by the four 90 quadrants. However, the field vectors 2-3 and 1-4 at the 45 and 135 positions have a magnitude of approximately ~ ([).
In order to obtain a conventional rotating magnetic field (not shown) two sine waves of equal magnitude which are displaced 90 from each other and a mRdified sine wave are applied to terminals "a" and "b" of the orthogonally positioned coils 50 (Fig. 3). In the instant invention the increased amplitude field vectors 135 and 45 are obtained in the same ~, manner. This waveform arrangement of Figure 3 will be discussed in greater detail hereinafter with respect to Figure 4.
The sine waves (Fig. 3a and b) are generated by well-known means and the waveform shown in Fig. 3b leads the waveform of Fig. 3a by 90. A segment of a sine waveform (Fig. 3c) is also generated by known signal generating means and this signal is summed with the sine wave of Figure 3a resulting in the waveform Figure 3d. The sine wave of Figure 3b is applied to the "b" terminal of the quadrature air coils 50, whereas the resultant waveform (Fig. 3d) is applied to :`
.~ ~ .''.
5~
the "a" terminal of the quadrature coils 50. The block 71 (see Fig. 4) ls shown centered with respect to the quadrature coils 50. The rotating field produced by combinlng the two signals of Figure 3b and 3d is shown in Figure 3e. The arabic numbers 1 to 5 indicated on the rotating field are obtained by plotting the signals shown in Figure 3b and 3d at the designated time period 1 through 6. The Y coordinate of the sinusoidal waveform (Fig. 3b) is the abscissa, whereas the X~X' tFig. 3d) coordinates are the ordinates for the corresponding abscissa value.
As can be readily seen from Figure 3e, the 135 field vector (2-3) is greater in magnitude by ~ (I) than the magnitude of the remaining vectors I. The purpose of this 135 vector as well as the 45 vector 1-4 will be discussed hereinafter.
Referring again to Figure 1, the propagation of a bubble along the major loop pattern LM and then into and out of the minor loop pattern LI will be discussed in conjunction with the rotation magnetic field (Fig. 3e). For ease of understanding the numbered position of the rotating vector of Figure 3e causes the identical number in the bubble ~ircuit of Figure 1 to be polarized positively thereby causing the bubble 60 to propagate around the circuit.
Assume for example, that a bubble 60 is located at position 1 of the T element 6 when the vecotr is oriented at position 1 of Figure 3e. As is well-known in the art, the counterclockwise rotating magnetic field sequentially polarizes different parts of the T's and bars comprising the bubbl~ tracks which are made of permalloy, positively or negatively. Assuming that the bubble has a minus polarization, it is therefore attracted to the positive poles located at position 1 of the T element 6 when the rotating vector of 3L1`13~L5~4 I~`Lgure 3e is located in the 1 dlrection.
As the rotating field contlnues to rotate counter-clockwise and the vector arrlves at position 2, (Fig. 3e) it causes location 2 of bar 8 to become polarized positively and the bubble 60 moves thereto. As the rotating field continues to rotate counterclockwise through positions 3, 4, 1 and 2, the locations 3, 4, and 1 of the T element 10, and location
BACKGROUND OF THE INVENTION
Fie~ld of the Invention This invention relates in general to the field o~
magnetic bubble devices and in particular to the Eield of techniques for propagating bubbles in such magnetic devices.
Description_of the Prior Art In the best known prior art, which is exemplified by patents U.S. 3,714,639 and U.S. 3,896,421, for example, various transfer conductor techniques employing separate conductive transfer layers are utiliæed in order to transfer bit information from a ma~or to a minor loop and vise versa.
As can be well appreciated, the utilization of such a separate transfer conductor represents a complication in the overall bubble device circuitry and method of manufacture. Prior art devices employing separate transfer conductor layers require additional electronic circuitry to both energize it selectively and at the required time. Transfer conductors utilized in the prior art devices represents additional manufactoring steps, which normally comprises depositing a layer of Al-4% Cu, i.e.
aluminum with 4% copper, or Au upon a T-bar permalloy pattern.
These metallic layers then have to be patterned in the desired ~ ;
shape by using standard photolithography and chemical etching.
The width of the transfer conductors and bubble tracks are a few `~
microns, thus, it is very diffic~lt to manufacture several layers one on top of the other and maintain exact registration when employing conventional~ mask aligning techniques.
Bubble memory devices are known which have a portion of the major loop track in a common path with the minor loop ;
track. By applying a forward or reverse sequence to the in-plane field bubbles at the common junction may be diverted into one loop or the other. This structure requires complex : `
. .
5~4 circuitry and results in slow transfer.
From the above description it can be readily seen that the fabrication and utilization of the transfer conductor in a magnetic bubble device represents a complex arrangement for a magnetic bubble device. Accordingly, it is an object of this invention to provide a bubble memory that eliminates the transfer conductor so that a bubble device is simpler and more economical to build.
SUMMARY OF THE INVENTION
There is disclosed herein a magnetic bubble circuit arrangement consisting of major and minor loop tracks~ Shifting of bubbles between the major and minor loop tracks is accomplished without the use of prior art type transfer conductors by utilizing strong 45 and 135 Eield vectors and a sequencing or rotating field. These field vectors are utilized to provide a strong magnetic field at the transfer locations as the rotating field traverses a 360 rotation when it is desired to transfer into or out of the minor loops.
More specifically, the invention consists of a bubble memory which transfers bubbles by means of a continuous rotating in-plane field transfer conductor member comprising: (a) an arrangement of magnetic elements to form a major recirculating channel; (b) at least one arrangement of magnetic elements to form a minor recirculating channel; (c) means coupling the major channel with the minor channel and vice versa; (d) said bubbles being propagated around said major channel and into and out of said minor channels by means of the in-plane rotat-ing field bit without said transfer member.
,.~ -BRIEF DESCRIPTION OF THE DRAWINGS
Figure l depicts the major and minor loop track circuitry utilized in the instant inventlon.
Figure 2 shows another arrangement of transfer elements of the major and minor loop tracks.
Figure 3 depicts the arrangement for obtaining the 45 and 135 vectors.
Figure 3e depicts the rotating field vector utili~ed in this invention.
Figure 4 shows in block form the circuit arrangement -for energizing the orthogonal coil pairs.
DESCRXPTION OF THE PREFERRED EMBODIMENT
Referring now to Figure 1, there is depicted the .
15~
magrle~lc bubble circ-lit utilized in this invention and composed oE a major loop pattern or track LM and a minor loop pattern or track LI formed on a permalloy garnet semiconductor material in ~hich sing1e wall domains can be moved. The major loop LM is shown partially populated and is comprised of the NiFe T-bar elements 6, 8, 10, 12, 14, 16, 18, 20 and 22. The minor loop LI is composed of the NiFe elements 15, 19, 21, 23, 75, 27, 29, 31, 33, 35, 37, 39, 41, 43, 17 and 26. Associated with the bubble circuit is a rotating magnetic field. This rotating magnetic field is represented by the field vector arrangement shown in Figure 3e. It should be noted that field vectors 1, 2, 3 and 4 have the identical magnitude of current I in the directions represented by the four 90 quadrants. However, the field vectors 2-3 and 1-4 at the 45 and 135 positions have a magnitude of approximately ~ ([).
In order to obtain a conventional rotating magnetic field (not shown) two sine waves of equal magnitude which are displaced 90 from each other and a mRdified sine wave are applied to terminals "a" and "b" of the orthogonally positioned coils 50 (Fig. 3). In the instant invention the increased amplitude field vectors 135 and 45 are obtained in the same ~, manner. This waveform arrangement of Figure 3 will be discussed in greater detail hereinafter with respect to Figure 4.
The sine waves (Fig. 3a and b) are generated by well-known means and the waveform shown in Fig. 3b leads the waveform of Fig. 3a by 90. A segment of a sine waveform (Fig. 3c) is also generated by known signal generating means and this signal is summed with the sine wave of Figure 3a resulting in the waveform Figure 3d. The sine wave of Figure 3b is applied to the "b" terminal of the quadrature air coils 50, whereas the resultant waveform (Fig. 3d) is applied to :`
.~ ~ .''.
5~
the "a" terminal of the quadrature coils 50. The block 71 (see Fig. 4) ls shown centered with respect to the quadrature coils 50. The rotating field produced by combinlng the two signals of Figure 3b and 3d is shown in Figure 3e. The arabic numbers 1 to 5 indicated on the rotating field are obtained by plotting the signals shown in Figure 3b and 3d at the designated time period 1 through 6. The Y coordinate of the sinusoidal waveform (Fig. 3b) is the abscissa, whereas the X~X' tFig. 3d) coordinates are the ordinates for the corresponding abscissa value.
As can be readily seen from Figure 3e, the 135 field vector (2-3) is greater in magnitude by ~ (I) than the magnitude of the remaining vectors I. The purpose of this 135 vector as well as the 45 vector 1-4 will be discussed hereinafter.
Referring again to Figure 1, the propagation of a bubble along the major loop pattern LM and then into and out of the minor loop pattern LI will be discussed in conjunction with the rotation magnetic field (Fig. 3e). For ease of understanding the numbered position of the rotating vector of Figure 3e causes the identical number in the bubble ~ircuit of Figure 1 to be polarized positively thereby causing the bubble 60 to propagate around the circuit.
Assume for example, that a bubble 60 is located at position 1 of the T element 6 when the vecotr is oriented at position 1 of Figure 3e. As is well-known in the art, the counterclockwise rotating magnetic field sequentially polarizes different parts of the T's and bars comprising the bubbl~ tracks which are made of permalloy, positively or negatively. Assuming that the bubble has a minus polarization, it is therefore attracted to the positive poles located at position 1 of the T element 6 when the rotating vector of 3L1`13~L5~4 I~`Lgure 3e is located in the 1 dlrection.
As the rotating field contlnues to rotate counter-clockwise and the vector arrlves at position 2, (Fig. 3e) it causes location 2 of bar 8 to become polarized positively and the bubble 60 moves thereto. As the rotating field continues to rotate counterclockwise through positions 3, 4, 1 and 2, the locations 3, 4, and 1 of the T element 10, and location
2 of the bar 12 become consecutively polarized positively so that the bubble i9 propagated along the major loop LM until it reaches bar 12.
At this point in time, let it be assumed that it is desired to move the bubble 60 from the major loop LM and into the minor loop LI. The strong 135 vector is therefore generated so that the position 2-3 on the element 15 becomes more positively polarized than position 3 of element 14.
It should be recalled that the vector 2-3 has a magnitude of approximately ~ (I) current. Therefore, the bubble will be more strongly attracted to the position 2-3 than it will be position 3. The bubble is also more strongly attracted to position 2-3 than position 3 because transfer between position 2 and 2-3 is a lower impedance path because of the premalloy than is the transfer between positlons 2 and
At this point in time, let it be assumed that it is desired to move the bubble 60 from the major loop LM and into the minor loop LI. The strong 135 vector is therefore generated so that the position 2-3 on the element 15 becomes more positively polarized than position 3 of element 14.
It should be recalled that the vector 2-3 has a magnitude of approximately ~ (I) current. Therefore, the bubble will be more strongly attracted to the position 2-3 than it will be position 3. The bubble is also more strongly attracted to position 2-3 than position 3 because transfer between position 2 and 2-3 is a lower impedance path because of the premalloy than is the transfer between positlons 2 and
3, which is a higher impedance path because of the presence of air between these two positions.
Upon reaching position 2-3, the bubble is then transferred into the m~nor loop LI via positions 3 and 4 of ~i-element 15, position 1 of element 19~ position 2, 3 and 4 of element 21, position 1 of element 23, position 2, 3 and 4 of element 25, position 1 of element 27, position 2 of element 29 which are consecutively polarized positively by the rotating field vectors. The transition member 31 is then consecutively - 6 - ~ ;
~ ,~
5~
polarized posit:Lvely at positions 3, 4 and as the rotating field is at the vector positions 3, 4 and 1.
It should be noted hereat the bubble 60 is transferred from the major loop LM to the minor loop LI without the use of any transfer conductor. As the rotating field continues to rotate in the counterclockwise direction, the positions 2, 3, 4, 1, 2, 3, 4, 1, 2, 3 and 4 o elements 33, 35, 37, 39, 41, 43 and 17, respectively are consecutively polarized positively so that the bubble element traverses this path.
The bubble at this point could be re-circulated in the minor loop via the T element 26 if it were so desired.
Let us assume, however, that it is desired that the bubble 60 be transferred out of the minor loop LI and back into the major loop LM. In this case, the 45 vector 1-4 is produced in the same manner as the 2-3 vector was generated.
This 1-4 vector causes position 1-4 of element 17 to be polarized positively and the bubble 60 is transferred thereto.
The bubble 60 will be more strongly attracted to position 1-4 of element 17 than to position 1 of element 26 because of the strong polari7ation of position 1-4 by the vectar 1-4 as well as for the aforementioned reasons, namely, the lower impedance both between positions 4 and 1-4 as opposed to the path between positions 4 and 1. The continued rotation of the rotating field to positions 1 and 2 accordingly transfers the bubble to position 1 of element 17 and position 2 of bar 16. The bubble now has been transferred out of the minor loop LI and into the major loop LM. Once again, this trans~er has been accomplished from minor loop to major\loop without the benefit of a transfer conductor.
The continuation of the rotating magnetic field as depicted in Figure 2 agains causes positions 3, 4, 1, 2, 3, 5~14
Upon reaching position 2-3, the bubble is then transferred into the m~nor loop LI via positions 3 and 4 of ~i-element 15, position 1 of element 19~ position 2, 3 and 4 of element 21, position 1 of element 23, position 2, 3 and 4 of element 25, position 1 of element 27, position 2 of element 29 which are consecutively polarized positively by the rotating field vectors. The transition member 31 is then consecutively - 6 - ~ ;
~ ,~
5~
polarized posit:Lvely at positions 3, 4 and as the rotating field is at the vector positions 3, 4 and 1.
It should be noted hereat the bubble 60 is transferred from the major loop LM to the minor loop LI without the use of any transfer conductor. As the rotating field continues to rotate in the counterclockwise direction, the positions 2, 3, 4, 1, 2, 3, 4, 1, 2, 3 and 4 o elements 33, 35, 37, 39, 41, 43 and 17, respectively are consecutively polarized positively so that the bubble element traverses this path.
The bubble at this point could be re-circulated in the minor loop via the T element 26 if it were so desired.
Let us assume, however, that it is desired that the bubble 60 be transferred out of the minor loop LI and back into the major loop LM. In this case, the 45 vector 1-4 is produced in the same manner as the 2-3 vector was generated.
This 1-4 vector causes position 1-4 of element 17 to be polarized positively and the bubble 60 is transferred thereto.
The bubble 60 will be more strongly attracted to position 1-4 of element 17 than to position 1 of element 26 because of the strong polari7ation of position 1-4 by the vectar 1-4 as well as for the aforementioned reasons, namely, the lower impedance both between positions 4 and 1-4 as opposed to the path between positions 4 and 1. The continued rotation of the rotating field to positions 1 and 2 accordingly transfers the bubble to position 1 of element 17 and position 2 of bar 16. The bubble now has been transferred out of the minor loop LI and into the major loop LM. Once again, this trans~er has been accomplished from minor loop to major\loop without the benefit of a transfer conductor.
The continuation of the rotating magnetic field as depicted in Figure 2 agains causes positions 3, 4, 1, 2, 3, 5~14
4 etc. of elements 18, 20 and 22, respectively to be consecutively polarized positively so that the bubble will propagate again along the major loop LM.
Referring now to Figure 4, there is depicted the implementation to achieve the bubble propagation between the ma~or loop LM to minor loop LI and vice versa. Block 71 represents the material in which single wall domains can be moved on the major and minor loops and includes the vertioal ma~or loop LM and the horizontal minor loops LI to LI16. It should be understood by the reader that other minor loops are formed on the left side of the loop LM but they are not shown for purposes of simplicity.
The fact that information in the major loop LM and the minor loops LI - LI16 are always moving in a synchronized fashion it permits parallel transfer of a selected word to the vertical loop LM by the expedient of tracking via the controller 73 the number of rotations of the in-plane field and accomplishing parallel transfer of the selected word out of and into the minor loops LI - LI16 during the proper rotation. Transfer is initiated by a transfer command 79 and is executed at the bubble cycle by the control circuit 73. The control circuit 73 activates the utilization circuits comprising cirucits 76 and 78. This activation causes the generation of the 45 and ;
135 vectors (Fig. 3e) at the appropriate time. It should be noted that the control circuit 73 activates circuits 74, 75 continuously except when it is in a standby state.
Once transferred, from the minor loop LI to the major loop LM, information moves in the major channel LM to a read-write position represented by the arrows connected to the input-output circuit 72. This movement occurs in response to consecutive rotations of the in-plane field synchronously ::
Referring now to Figure 4, there is depicted the implementation to achieve the bubble propagation between the ma~or loop LM to minor loop LI and vice versa. Block 71 represents the material in which single wall domains can be moved on the major and minor loops and includes the vertioal ma~or loop LM and the horizontal minor loops LI to LI16. It should be understood by the reader that other minor loops are formed on the left side of the loop LM but they are not shown for purposes of simplicity.
The fact that information in the major loop LM and the minor loops LI - LI16 are always moving in a synchronized fashion it permits parallel transfer of a selected word to the vertical loop LM by the expedient of tracking via the controller 73 the number of rotations of the in-plane field and accomplishing parallel transfer of the selected word out of and into the minor loops LI - LI16 during the proper rotation. Transfer is initiated by a transfer command 79 and is executed at the bubble cycle by the control circuit 73. The control circuit 73 activates the utilization circuits comprising cirucits 76 and 78. This activation causes the generation of the 45 and ;
135 vectors (Fig. 3e) at the appropriate time. It should be noted that the control circuit 73 activates circuits 74, 75 continuously except when it is in a standby state.
Once transferred, from the minor loop LI to the major loop LM, information moves in the major channel LM to a read-write position represented by the arrows connected to the input-output circuit 72. This movement occurs in response to consecutive rotations of the in-plane field synchronously ::
5~
wlth the counterclockwisc movement of information in the parallel channels. ~ read or wrlte operation is responslve to signals (data-in, data-out) under the instructlon control of circuit 73. The circuit 73 also controls and activates the field source 50 for the rotating magnetic field 50 (Fig. 3).
T~us, phase Y (Fig. 4) will be activated by the sinusoidal waveform (Fig. 3b) from circuit 74. The output of this signal will be connected to terminal "b" of the quadrature coils 50 (Flg. 3). Similarly, the control circuit 73 is connected to circuit 76 which will cause the sine wave segment signal (Fig. 3c), and the sinusoidal waveform (Fig. 3a) to be activated by the control circuit 73. The signals emanating from circuits 75, 76 are outputted to the input terminals of the adding network 78. As can be readily seen, therefore, the output of the networks 75, 76 is forwarded to the adding network 78 (Fig. 3d) and thence to terminal "a" of the quadrature coil 50 (Fig. 3)~ In like manner, the output of network 74 is fed directly to terminal "b" of the quadrature coil.
The circuitry discussed abov~e is generally known in the art and may be further reviewed by referring to patent U.S. 3,618,054.
Having explained two preferred embodiment transfer elements in Figures 1 and 2, it will be understood from the explanation of Figure 4 that other shapes of elements may be employed for major loop tracks LM and minor loop tracks LI, and that the transfer loop tracks 15 and 17 may be selected by field vectors which differ from those which propagate the bubbles in the major and minor loops. As an example, pulses generated at control circuit 73 may be applied to terminals "a" and "b" of coil 50 to effect transfer of bubbles out of loop LM and LI into transfer tracks 15 and 17 or vice versa.
_ 9 _
wlth the counterclockwisc movement of information in the parallel channels. ~ read or wrlte operation is responslve to signals (data-in, data-out) under the instructlon control of circuit 73. The circuit 73 also controls and activates the field source 50 for the rotating magnetic field 50 (Fig. 3).
T~us, phase Y (Fig. 4) will be activated by the sinusoidal waveform (Fig. 3b) from circuit 74. The output of this signal will be connected to terminal "b" of the quadrature coils 50 (Flg. 3). Similarly, the control circuit 73 is connected to circuit 76 which will cause the sine wave segment signal (Fig. 3c), and the sinusoidal waveform (Fig. 3a) to be activated by the control circuit 73. The signals emanating from circuits 75, 76 are outputted to the input terminals of the adding network 78. As can be readily seen, therefore, the output of the networks 75, 76 is forwarded to the adding network 78 (Fig. 3d) and thence to terminal "a" of the quadrature coil 50 (Fig. 3)~ In like manner, the output of network 74 is fed directly to terminal "b" of the quadrature coil.
The circuitry discussed abov~e is generally known in the art and may be further reviewed by referring to patent U.S. 3,618,054.
Having explained two preferred embodiment transfer elements in Figures 1 and 2, it will be understood from the explanation of Figure 4 that other shapes of elements may be employed for major loop tracks LM and minor loop tracks LI, and that the transfer loop tracks 15 and 17 may be selected by field vectors which differ from those which propagate the bubbles in the major and minor loops. As an example, pulses generated at control circuit 73 may be applied to terminals "a" and "b" of coil 50 to effect transfer of bubbles out of loop LM and LI into transfer tracks 15 and 17 or vice versa.
_ 9 _
Claims (12)
1. A bubble memory which transfers bubbles by means of a continuous rotating in-plane field transfer conductor member comprising:
a.) an arrangement of magnetic elements to form a major recirculating channel;
b.) at least one arrangement of magnetic elements to form a minor recirculating channel;
c.) means coupling the major channel with the-minor channel and vice versa;
d.) said bubbles being propagated around said major channel and into and out of said minor channels by means of the in-plane rotating field bit without said transfer member.
a.) an arrangement of magnetic elements to form a major recirculating channel;
b.) at least one arrangement of magnetic elements to form a minor recirculating channel;
c.) means coupling the major channel with the-minor channel and vice versa;
d.) said bubbles being propagated around said major channel and into and out of said minor channels by means of the in-plane rotating field bit without said transfer member.
2. The bubble memory in accordance with Claim 1 wherein said in-plane rotating field is generated by means of a quadrature coil having first and second input terminals.
3. The bubble memory circulating arrangement in accord-ance with Claim 1 wherein said in-plane rotating field incorporates at least two vector shifts, both of said vector shifts having a greater magnitude than the remainder of said rotating vector field.
4. The bubble memory circulating arrangement in accord-ance with Claim 2 wherein said vector shift is formed by adding a first sine wave in combination with a sine-wave segment and connecting the output to the first terminal of the quadrature coil.
5. The bubble circulating arrangement in accordance with Claim 2 wherein a second sine wave which leads said first sine wave is connected to the second terminal of said quadrature coil.
6. A bubble memory device of the type having permalloy patterns in the same plane consisting of a major loop track, a minor loop track and a transfer track for propagating bubbles by means of externally generated continuously rotating field vectors in the plane of said permalloy patterns, and control means for applying said externally generated field vectors in a first sequence to propagate bubbles in said major loop track and said minor loop track, and in a separate sequence to propagate said bubbles between said major loop track and said minor loop track by means of said externally generated field.
7. A bubble memory device of the type having a minor loop bubble track, a major loop bubble track and a transfer bubble track comprising permalloy patterns in the same plane, and having an external field device for propagating the bubbles in said minor loop and said major loop bubble tracks character-ized by:
said transfer bubble track comprising an elongated permalloy pattern having one end of said transfer bubble track adjacent to a normal positional location of a bubble in said minor loop bubble track and the other end of said elongated permalloy pattern being adjacent to a normal positional location of a bubble in said major loop bubble track, in-plane continuously rotating field means for generating a first plurality of field vectors having different directions of effective fields in the plane of said permalloy patterns which propagates said bubbles around said major and said minor loop bubble tracks, and said in-plane rotating field means further comprising control means for generating a transfer field vector in said plane of said permalloy patterns for diverting bubbles in one of said loop tracks through said transfer track to the other of said loop tracks.
said transfer bubble track comprising an elongated permalloy pattern having one end of said transfer bubble track adjacent to a normal positional location of a bubble in said minor loop bubble track and the other end of said elongated permalloy pattern being adjacent to a normal positional location of a bubble in said major loop bubble track, in-plane continuously rotating field means for generating a first plurality of field vectors having different directions of effective fields in the plane of said permalloy patterns which propagates said bubbles around said major and said minor loop bubble tracks, and said in-plane rotating field means further comprising control means for generating a transfer field vector in said plane of said permalloy patterns for diverting bubbles in one of said loop tracks through said transfer track to the other of said loop tracks.
8. A bubble memory device as set forth in claim 7 wherein said in-plane rotating field comprises a quadrature coil having first and second input terminals adapted to generate directional field vectors in said plane of said permalloy patterns.
9. A bubble memory device as set forth in claim 7 wherein said in-plane rotating field control means includes means for generating at least two transfer vectors having a greater order of magnitude than the remainder of said first plurality of field vectors.
10. A bubble memory device as set forth in claim 8 wherein said transfer vector is formed by adding a first sine wave in combination with a segment of a sine wave and connecting the output of said sine waves to a first terminal of said quadrature coil.
11. A bubble memory device as set forth in claim 8 wherein said transfer vectors comprise pulses of short duration having the same direction as said first plurality of field vectors.
12. A bubble memory device as set forth in claim 10 which further includes a second sine wave which leads said first sine wave connected to the second terminal of said quadrature coil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64226775A | 1975-12-19 | 1975-12-19 | |
| US642,267 | 1991-01-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101544A true CA1101544A (en) | 1981-05-19 |
Family
ID=24575879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA267,058A Expired CA1101544A (en) | 1975-12-19 | 1976-12-02 | Bubble memory vector shift |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5277545A (en) |
| CA (1) | CA1101544A (en) |
| DE (1) | DE2657200A1 (en) |
| FR (1) | FR2335911A1 (en) |
| GB (1) | GB1570699A (en) |
| IT (1) | IT1065457B (en) |
| NL (1) | NL7614156A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4153947A (en) * | 1977-10-12 | 1979-05-08 | Control Data Corporation | Conductor driven field access magnetic bubble memory propagation system |
| US4175289A (en) * | 1978-06-05 | 1979-11-20 | International Business Machines Corporation | Serrated Y-bar magnetic bubble switch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3530446A (en) * | 1968-09-12 | 1970-09-22 | Bell Telephone Labor Inc | Magnetic domain fanout circuit |
| JPS5441182B2 (en) * | 1973-11-21 | 1979-12-07 |
-
1976
- 1976-12-02 CA CA267,058A patent/CA1101544A/en not_active Expired
- 1976-12-13 GB GB5186676A patent/GB1570699A/en not_active Expired
- 1976-12-17 IT IT3059176A patent/IT1065457B/en active
- 1976-12-17 JP JP15102476A patent/JPS5277545A/en active Pending
- 1976-12-17 DE DE19762657200 patent/DE2657200A1/en active Granted
- 1976-12-17 FR FR7638090A patent/FR2335911A1/en active Pending
- 1976-12-20 NL NL7614156A patent/NL7614156A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| IT1065457B (en) | 1985-02-25 |
| DE2657200C3 (en) | 1980-07-24 |
| DE2657200B2 (en) | 1979-05-31 |
| JPS5277545A (en) | 1977-06-30 |
| NL7614156A (en) | 1977-06-21 |
| DE2657200A1 (en) | 1977-07-07 |
| GB1570699A (en) | 1980-07-09 |
| FR2335911A1 (en) | 1977-07-15 |
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