SU744723A1 - Device for reading cylindrical magnetic domains - Google Patents

Description

(54) DEVICE FOR READING CYLINDRICAL MAGNETIC DOMAINS The proposed device relates to computer technology. A device for reading cylindrical magnetic domains (CMD) is known that contains information registers of CMD made in the form of ferromagnetic and current applications, applied to the plate of a magnetically uniaxial material and two pairs of sensors for reading the CMD {). Closest to the present invention is a CMD readout device, containing the CMD information registers, two communication channel pushing CMD channels, and the CMD dividers; made in the form of ferromagnetic and current applications deposited on a plate of magnetic material, and two CMD readout sensors 2). This readout device has only two CMD readout sensors and is not sufficiently robust, since it uses the amplt indicator of a scint and has an insufficient signal-to-noise ratio when reading down the CMDs. The purpose of the invention is to improve the noise immunity of the device. This goal is achieved by the fact that in it the logical elements are located 6T Strongly at each other at a distance of not less than the period of the promotion structures of the CMD and are located between the CMD registers and the readout sensors, and the communication circuits promoted by the CMD through the logical elements, as well as promoting CMD communication channels are magnetized through CMD dividers, which are located relative to each other at a distance of less than two periods of the promotion structures of the CMD, and that the communication channels promoting CMD are magnetically connected CMD players located relative to each other at a distance of at least one period of CMD promotion structures. Due to the described magnetic connections pushing the CMD communication channels, the information presented by the CMD is output. in a paraphase code, so on. If one unit is moving and reading over one channel (there is a CMD), then another channel is moving and reading zero (no CMD) over the other channel, and vice versa, if to one

The communication link Kaira.iy is advanced and read unit.

Due to such coding of information, as well as due to the inclusion of sensors of reading, i.e., information digits and tsules from the output of the reader are represented by signals of different polarity.

Fia FIG. 1 and FIG. 2 images CMD reading devices; ria FIG. 3, 4 and 5 - the same, variants.

The proposed device is made as follows.

On the guverity of the plate 1 of a magnetically uniaxial material with CMD 2, 3, 4, 5, the first group of registers 6 CMD, the second group of registers 7 CMD, the first promoting CMD communication channel 8, the second promoting CMD communication channel 9, dividers 10 CMD connecting the first group of CMD registers 6 with a communication channel 8, dividers 11 CMD connecting the second group of registers 7 with the second communication channel 9, logic bar 12, 13 ban / repeat, formed by unidirectional magnetic connections, respectively channel 8 to channel 9 and channel 9 to channel 8 in places of magnetic and 14 and 15, 16 generators,

17 secondary CMD connected respectively to channels 8 and 9, annihilators

18 and 19 CM / 1 are also connected respectively to channels 8, sensors 20, 21, CMD readings connected respectively to channels 8 and 9. Resistors 22, 23 connected to sensors 20, 21 in a bridge circuit are outside plate 1 .

The device works as follows.

From registers b and 7 CM.DB 2, 3 with the help of dividers 10 and II CMD fall into communication channels 8 and 9 and further, arrive at the inputs of the logic element 12. The distance between CMD entering the channels 8 and 9 is equal to two periods of promotion structures CMD. Moreover, the sequences of domains 2 and 3 arrive at the inputs of the logic element 12 not simultaneously, but with a shift for the period of the advance structures, which is achieved by an unequal number (in one channel for a period more) periods of the advance structures from dividers 10 and II to the link 14. For In order for the channel 8 information to be represented in a paraphasic code, in the intervals between the CMD 3 of the channel 9 from the generator 17, the CMD 5 is recorded, which arrive at the communication point 14 simultaneously with the CMD 2 of the channel 8.

If in channel 8 there is an information unit (CM.MD 2), then at the site 14 of the node 12, the CMD 2 pushes the CMD 5 and an nigil 19, and then the passage 15 of the site 15 of the node 13 enters the sensor 20, causing from the output of a bridge circuit a signal, for example, of a positive polarity.

If in channel 8 there is an information zero (no CMD 2), then CM11 5 is not magnetically affected at link 14, but leaves the output of node 12 through channel 9 and, further, the passage of communication 15 of node 13 enters the sensor 21, the signal from the output of the bridge circuit has a negative polarity signal.

In order for the channel 9 information to be represented in a paraphase code, in the intervals between the CMD 2 of the channel 8 from the generator 16, the CMD 4 is recorded, which arrive at the communication point 15 simultaneously with the CMD 3 of the channel 9.

If in channel 9 there is an information unit (CMD 3), then at the communication point 15 of node 13 CMD 3 pushes CMD 4 into the annihilator 18 and, further, the passage through channel 9 enters sensor 21, causing a negative field signal from the output of the bridge circuit rnness.

If there is an Information Zero in channel 9, the CMD 4 is not subjected to a magnetic effect at communication location 15, but leaves the output of node 13 via channel 8 and enters sensor 20, causing a positive polarity signal from the output of the bridge circuit.

Thus, in the read mode, the information represented by the CMD is output and read in a paraphase code, for example, in n, n-f 2, etc. The control field for the information registers bip n - l 1, n + 3 and t d., control field periods for information registers 7.

As a result, a polar readout indication of the CMD is performed for two sets of information registers and two communication channels by two CMD reading sensors.

FIG. 2 shows a device for reading CMD, similar to the device shown in FIG. 1. The differences are that the logic elements 12 and 13 are made in the active version using the CMD expansion conductors, which at the time of the interaction of the CMD through the control field period (for example, n, n - f 2, n 4-4 and etc. periods) current pulses are applied, and also in that the generators 16, 17 of the auxiliary CMD 4, 5 are located at the beginning of communications 8 and 9. In this case, the generators 16, 17 can also be used to write information to the registers 6 and 7.

In the devices shown in FIG. 3, 4 and 5, the representation of information in a paraphase code is also achieved. Logic elements in these devices are made in the active version with the help of CMD expansion conductors in the band domain. Moreover, these conductors simultaneously play the role of the CMD division conductors and are part of the 10, II CMD dividers. The interaction of information CMD 2 and 3 with auxiliary CMD 4 and 5 occurs at the time of stretching CMD 2 and 3 from the positions of registers 6 and 7 at the position of channels 8 and 9. If there are information units (Fig. 3) in channels 6 and 7 ( CMD 2 and CMD 3), then the stretched state of CMD 2 and CMD 3 push CMD 4 and CMD 5 into annihilators 18 and 19. Entering sensors 20 and 21 CMD 2 and 3 cause a signal from the output of the bridge circuit, for example, positive polarity when reading a unit (n-th period) from registers 3 and negative polarity when reading a unit from reglters 4 (n -f I Heat-). Conversely, if CMD 4, 5 enters sensors 20 and 21 (in channels B and 7 are zero), then at the output of the bridge circuit we have signals of negative polarity (n-th period) when reading from registers 3 and positive. polarities - when reading from registers 3 and positive polarities - when reading from registers 4 (n-1 period). The CMD reading devices shown in FIG. 4 and 5 are different from the device in FIG. 3 by the fact that, in the case of magnetic interaction, CMD 2, 3 do not push CMD 4, 5, but prohibit them from generating in channels 8, 9 (Fig. 4) or forcing them to annihilate (Fig. 5). Therefore (Fig. 4), the unit generators are directly connected to channels 8, 9 in series with the conductors of dividers 10, 11, and there are no annihilators 18, 19 CMD, and (Fig. 5) annihilators 18, 19 are included in logical nodes 12, 13.

The proposed device improves the noise immunity of the device by using the polar sign reading of the CMD. Improving noise immunity allows either to increase the percentage of variation in the characteristics of the CMD readout sensors affecting the signal-to-noise ratio, or by combining several noise-resistant couples of the CMD readout sensors into a single bridge circuit (using phase separation of readout signals), reduce the number of read amplifiers and reduce conclusions of the solid-state memory module on the CMD, or to allow large technological errors in the design of the module, causing interference in the paths with ityvani, li744723

to allow large variations in the parameters of read amplifiers, or, in the case of using magnetoresistive sensors, to reduce the degree of CMD expansion into the band domain and. therefore, increase the degree of integration of the device.

Claims (2)

Invention Formula {. A device for reading cylindrical magnetic domains (CMD) containing a plate of a magnetically uniaxial material with two groups of CMD registers located on it, each of which is magnetically connected, with a corresponding CMD divider, two communication channels promoting CMD and sensors located and logical elements, characterized in that, in order to improve the noise immunity of the device, in it the logical elements are located relative to each other at a distance of not less than structures of advancement of CMD and are located between the registers of the CMD and the sensors of reading, and the channels of communication promoting the CMD of the magnetosheves are channeled through logic elements. 2. The device according to claim 1, characterized in that the communication channels advancing the CMD are magnetically coupled through the CMD dividers, which are located relative to each other at a distance of at least two gteryiods of the promotion structures of the CMD. 3. A device according to claim I, characterized in that the communication channels advancing CMD are magnetically coupled through the CMD dividers located relative to each other at a distance of at least one period of the promotion structures of the CMD. Sources of information taken into account in the examination 1.IEEE Trans, on Magn sol MAO. 12, No. 6 1976, p. 614-616. 2. “AIP Conf. Pross, No. 29, 1975, c. 51 - 53 (prototype).