RU1770986C - Information reading out unit for magnetic bubble domain storage device - Google Patents

Abstract

The invention relates to computer technology and can be used in boron technology. Ev, publisher A on OMelio when constructing storage devices on cylindrical magnetic domains. The purpose of the invention is to simplify the device and increase its reliability through the use of a double-winding drossel in a domain circuit of a bridge detector. The device comprises a domain detector 1, made according to a bridge circuit, in one adjacent arms of which magnetoresistive sensors 2 and 3 are included, and in other adjacent arms - windings of drossel 8 and 9 with an equal number of turns. In this case, the first conclusions of the sensors 2,3 are connected to one output of the power supply 4, and their second conclusions are connected through the dividing elements 5,6 to the inputs of the reading amplifier 7, the output of which is the output of the device. 1 ill. } WITH

Description

XI VI o

U 00

about

The invention relates to computer technology and can be used in the construction of storage devices on cylindrical magnetic domains (CMD).

A known unit for reading information for a memory device on the CMD, containing working and compensation magnetoresistive read sensors located on a magnetically-axis film, are included in one adjacent shoulders of the bridge circuit, the first outputs of these sensors being connected to one output of the power source, and the second leads are connected via isolation elements to the inputs of the read amplifier. Resistors are included in other adjacent arms of the bridge circuit, the first terminals of which are connected to another output of the power source.

In order to obtain a sufficient signal from the detector circuit, the resistances of the resistors included in the bridge circuit should be significantly (5 ... 10 times) greater than the resistances of the magnetoresistive sensors. To supply the bridge circuit of an GFI, this will require a separate high-voltage power supply. For example, for the micro assembly K1602RC2, the resistance of magnetoresistive sensors of which reaches 1500 Ohms, and the nominal value of the sensor current is 60.5 mA, a power supply with a voltage of 50 .., 100 volts is required. The use of such a separate power supply complicates the device and reduces its reliability.

The closest in technical essence and the achieved result to the proposed device is an information reading unit for a memory device on a CMD containing working and compensation magnetoresistive sensors located on a magneto-axial film included in one adjacent shoulders of the bridge circuit, the first outputs of these sensors being connected to one terminal of the power source, and their second terminals are connected through the dividing elements to the readout amplifier. Two adjacent current sources are included in other adjacent shoulders of the device bridge circuit, one of the terminals of which are connected to another terminal of the power source.

A disadvantage of the known device is its complexity and low reliability. This is because current sources contain a relatively large number of active (semiconductor devices) and passive elements. Changing the parameters of the elements of the current stabilizer circuits, especially active ones, during their aging leads to asymmetry in the bridge circuit, which further reduces the reliability of the known device.

An object of the invention is to simplify and increase the reliability of an information reading unit for a memory device on a DTM.

The goal is achieved in that the information reading unit for the memory device on the CMD, containing working and compensation magnetoreactive sensors located on the magneto-axial film, are included in one adjacent shoulders of the bridge circuit, the first outputs of these sensors being connected to one output of the power source, and their second conclusions are connected through the corresponding dividing elements to the inputs of the read amplifier, the output of which is the output of the information read block, contains two full-time inductor with a core made of magnet of soft material, rotor windings are made with an equal number of turns and are included in other adjacent shoulders of the bridge circuit, the end of the first and the beginning of the second winding of the throttle are connected to another output of the power source, and the beginning of the first winding and the end of the second winding are connected respectively to the second conclusions of magnetoresistive sensors.

The drawing shows a diagram of an information reading unit for a storage device on cylindrical magnetic domains.

The device comprises a domain detector 1, made according to the bridge circuit. One adjacent shoulders of the bridge circuit includes a working and compensation magnetoresistive read sensors 2 and 3 located on the magneto-axial film of the domain microcircuit. The first conclusions of these sensors are combined and connected to the first output of the power supply 4, and their second conclusions are connected through the dividing elements 5 and 6 in the form of capacitors to the inputs of the read amplifier 7, the output of which is the output of the device.

Other adjacent shoulders of the bridge circuit of the domain detector 1 are formed by windings 8 and an E-winding throttle 10. made with a core made of a magnet of soft material, and the windings of this throttle are made with an equal number of turns. The end of the first winding 8 and the beginning of the second winding 9 are connected to the second terminal of the power supply 4, and the beginning of the first winding 8 and the end of the second winding 9 are connected to the second terminals of the read sensors 2 and 3.

To provide the ability to set the nominal current value in the sensors

2 and 3 of the reader, a current-sensing resistor 11 can be installed, while between the connection point of the sensors 2 and

3 and the connection point of the windings 8 and 9 of the throttle 10 is installed capacitor 12.

The device operates as follows. In the initial position, when the domains under the magnetoresistive sensors 2 and 3, having the same resistances, are absent through them. and also through the windings of the throttle 10, currents of the same magnitude flow. In this case, due to the equality of the number of turns of the windings of the throttle 10 and the selected connection of its windings, the magnetization of the core of the chokes, and thus the reduction of the inductance of its windings, does not occur.

As the domain passes under the working sensor 2, its resistance changes (increases) due to the magnetoresistive effect. In this case, a voltage pulse is generated on the sensor 2, the amplitude of which is equal to the product of the increment of the sensor resistance by the amount of current through it. This voltage will be applied to the jumper 8 of the jumper and through the isolation capacitor 5 to the first input of the readout amplifier 7. Due to the magnetic coupling between the jokes of the jumper 10 and the equality of the number of turns, the voltage is the same in polarity and voltage across the winding 9. This voltage through the capacitor 6 will be applied to the second input of the read amplifier 7. Thus, between the inputs of the read amplifier 7, the voltage doubled in magnitude, compared to the voltage on the sensor 2, will act. At the output of a read amplifier 7 controlled by a read strobe, an output signal is generated.

In the absence of a domain, a magnetic field for controlling domain promotion acts on the working sensor 2. In this case, the sensor 2 generates an interference signal. The sensor 3 generates exactly the same signal, so the signals are suppressed in the read amplifier. Thus, the read amplifier

only the signal generated by the domain when it passes under the working magnetoresistive sensor 2 is extracted.

If it is necessary to regulate the current through the sensors 2.3, a current-sensing resistor 11 can be installed in the devices. BUT, installing this resistor will reduce the signal at the inputs of the read amplifier 7, since the resistor is connected in series with the windings of 8.9 throttle 10. To prevent a decrease in the signal, a capacitor 12 is installed whose capacitance is selected from the condition of obtaining low resistance at the signal frequency.

In the practical implementation of the device, the inductor can be made on a ring core made of ferrite with high magnetic permeability, while the windings are wound in two wires. A ready-made small-sized pulse transformer with two identical windings, for example, TII-4, can also be used as a throttle.

Claims (1)

The claims An information reading unit for a storage device on cylindrical magnetic domains, comprising a working and compensation magnetoresistive read sensors located on a magnetically uniaxial film, included in one adjacent arm of the bridge circuit, the first outputs of these sensors being connected to one output of the power source, and their second outputs through the corresponding dividing elements to the inputs of the read amplifier, the output of which is the output of the information reading unit, characterized in that, in order to simplify To increase and increase the reliability of the information reading unit, it contains a two-winding inductor with a core made of magnet of soft material, the windings of which are made with an equal number of turns and are included in other adjacent shoulders of the bridge circuit, the end of the first and the beginning of the second windings of the drossel are connected to another output of the power source, and the beginning of the first winding and the end of the second winding, respectively, to the second terminals of the magnetoresistive sensors.