A read amplifier for a memory device

 

(57) Abstract:

Usage: in computing to build a mass storage device on a cylindrical magnetic domains, designed to work in conditions of spacestate and in a wide temperature range. The inventive amplifier reader contains four of the generator 1, 3, 10, 11 current, Zener diodes 2, 7, transistors 8, 9, compensating and information detectors 4, 5 cylindrical magnetic domains, the resistor 6, the load resistors 13, 14, comparator 16 voltage variable resistor 15 and the capacitor 12. The technical result is to increase the noise immunity, reliability in terms of spacestate and simplify storage device including a read amplifier. 1 Il.

The invention relates to computing and can be used to build storage devices on a cylindrical magnetic domains, designed to work in conditions of spacestate and in a wide temperature range. The read amplifier is designed to work as part of digital machines, part of the Autonomous electronic systems.

Known amplifiers Citywest the closest in technical essence is the amp reading which is widely distributed in the applicable law of Ukraine on the CMD of the different options.

This device contains a first current generator connected to the input of the first detector of the CMD, the second current generator connected to the input of the second detector of the CMD. The input of the first detector via a first capacitor connected to the first input of the operational amplifier (op-amp). The input of the second detector via a second capacitor connected to a second input of the shelter, through which the resistor is connected to a common bus. The output of the shelter through a resistive divider connected to the common bus. Mid-point of the divider through a feedback resistor connected to the first input of the OS. The output of the shelter through the capacitor connected to the first input of the voltage comparator. The first comparator input connected to the collector of the switching transistors. The emitter of this transistor is connected to the shared bus, and the base through a resistor connected to the terminal control signals. The second comparator input is connected to the middle point of the voltage divider made on the resistors, and the divider is connected between the input terminal of the threshold voltage and a common bus. The output of the comparator is the output device.

The disadvantages of this amplifier are lack of reliability when work is asenna complexity. Lack of reliability is due to the fact that when working in conditions of spacestate change of the reference voltage forming the threshold voltage at the second comparator input, which reduces the reliability of read data. The lack of immunity in the known amplifiers reading due to the presence of separation ("longitudinal") capacitor between the detectors of the CMD and the inputs of the OS, and the same capacitor between the output of the OS and the comparator input. It is known that such circuits tend to capture impulse noise propagating both the power bus, and air. In addition, the output OS, you may experience interference due to the asymmetry of the input RC and other chains. Asymmetry also leads to insufficient attenuation of the common mode induced impulse noise, which occurs under the influence of pulse shapers rotating field, and transfers the input and output switching power supply.

The need for such decoupling capacitor due to the uncertainty of the potentials of the voltage detectors CMD due to the large scatter DC resistance, but also due to the large depend what neobhodimosti control signal, which is formed as part of the controller. This signal is supplied to the base of the switching transistors, causes the opening of the latter, which is necessary for the discharge of the coupling capacitor C3 is located between the OS and the comparator input. The control pulse appears before the expected information signal and performs restoration of the permanent component of the capacitor. The magnitude of the DC component may vary depending on different combinations of sequence "units" and "zeros", coming from the detectors of the CMD. The need for the specified coupling capacitor due to the fact that the potential at the output OS is floating.

In all known amps reading, as a rule, apply the dividing capacitors both at the input and at the output of the shelter.

The invention consists in that the amplifier for reading a storage device on a cylindrical magnetic domains (CMD), containing the first current generator connected to the input of the first detector of the CMD, the second current generator connected to the input of the second detector, a voltage comparator whose output is the output, inputs of the third and chewbaca of the first transistor is connected to the input of the first detector, the base of the second transistor is connected to the input of the second detector. The output of the third current generator connected to the emitter of the first transistor and through a capacitor to the output of the fourth current generator, and the emitter of the second transistor. The collectors of the second and first transistors through the first and second load resistors connected to the first and second findings of the variable resistor. The average output of the latter is connected to the power bus. The first and second inputs of the voltage comparator is connected respectively to the collectors of the first and second transistors.

The drawing shows an electric diagram of the proposed amplifier for reading a storage device on a cylindrical magnetic domains.

The base of the transistor of the first current generator 1 is connected to the anode of Zener diode 2. The base of the transistor of the second current generator 3 is connected to the anode of Zener diode 2. The findings of the resistors included in the current generators 1 and 3, is connected to the power bus. The cathode of the Zener diode 2 is connected to the power bus. The collector of the transistor of the power generator 1 is connected to the input of the first compensating detector CMD 4. The collector of the transistor of the power generator 3 is connected to the input (news, main) detector Cloidine to the cathode of the Zener diode 7, and the anode of the latter is connected to the shared bus. The base of the amplifying transistor 9 is connected to the input of the detector CMD 4. The base of the amplifying transistor 9 is connected to the input of the detector CMD 5. The emitter of transistor 9 is connected to the collector of the transistor of the power generator 11. The collector of the transistor of the current generator 10 is connected to the emitter of the transistor 8 and through a capacitor 12 to the collector of the transistor of the power generator 11. Bases of the transistors of the current generators 10 and 11 are connected to the cathode of the Zener diode 7. The collector of transistor 8 is connected to the first output load resistor 13. The collector of transistor 9 is connected to the first output load resistor 14. Between the second terminals of the resistors 13 and 14 connected to the potentiometer 15. Items 8-15 form a preliminary linear pulse amplifier. The slider of potentiometer 15 is connected to the power bus. The first input of the comparator 16 is connected to the collector of the transistor 8, the second input of the comparator 16 to the collector of the transistor 9. The power pins of the comparator 16 is connected to the shared bus and to the power bus, respectively. The output of the comparator 16 is an output device.

Consider the operation of the amplifier when no input signals in static mode. After initial power-up on children who I detectors currents, coming from the generators 1 and 3. Because of the resistance of the detectors have a large scatter of values in the manufacture and strong dependence on temperature, the extent and magnitude of the voltage drop across the detectors can vary within wide limits. The magnitude of the currents through the transistors 8 and 9 are not defined by the potentials on the detectors 4 and 5, and the values of the currents generated by the generators 10 and 11. For this reason, the potentials at the collectors of transistors 8 and 9 are determined only by the position of the slider of the potentiometer 15. The generators 10 and 11, the transistors 8 and 9, the load resistors 13 and 14 and the potentiometer 15 form a nearly balanced bridge circuit. Two vertices of the bridge is connected between the power bus and the other two vertices are connected to the inputs of the comparator. The arm 15 is set so that the voltage at the input 2 of the comparator 16 is higher than the input 1 on multiple units or tens of millivolts. The threshold comparator is set using the potentiometer 15.

It is known that every comparator (item 16) or the operational amplifier has a parameter such as voltage offset of zero. The bias voltage of zero depends on the temperature, and therefore introduced such pairs is ihade pre-amplifier transistors 8 and 9, when a signal unit must be obviously more threshold comparator 16. The threshold is determined by the position of the potentiometer 15. Thus, the gain of the pre-amplifier must be sufficient so that you do not count with the temperature coefficient of zero offset of the comparator. In the proposed amplifier is because the zero offset can be in the tens of millivolts, while the amplitude of the pulse at the output of the pre-amplifier is hundreds of millivolts.

Thus, the bridge circuit is in a position close to balanced. The voltage at the output of the comparator 16 receives a low level.

Consider the operation of the amplifier when an input common-mode interference. Sources of such interference can be the following devices: shaper rotary field; shaper pulse generators CMD, transfers input and output; switching power supplies.

Because the amplifier is a fully symmetrical differential device, it has the ability to complete suppression of common mode noise.

Consider the operation of the amplifier when reading the signal unit. During the passage of a cylindrical magnetic domain under the main det polarity with amplitude in units of millivolts. As a consequence, the collector of transistor 9, you receive the amplified pulse of negative polarity. The amplitude of this pulse is in absolute value greater than the value of the initial offset between the inputs of the comparator 16. As a result, the switching of the comparator 16 and its output is formed by a pulse of positive polarity amplitude close to the supply voltage. With the passage of zeros under the detector CMD amplitude of the resulting signal is sufficient to switch the comparator 16. The magnitude of the gain of pre-amplifier transistors 8 and 9 depends mainly on the magnitude of the load resistors 13 and 15 and the supply voltage, since the pulse component of the emitters of transistors 8 and 9 are shorted through the condenser 12 a sufficiently large capacity.

The proposed amplifier readout can be implemented as an integrated circuit. In one case there are four amplifier read.

Increased robustness in the proposed amplifier is ensured by the fact that in the proposed device was able to abandon the separation ("longitudinal") capacitor between the detectors of the CMD and I the house of the pre-amplifier and the comparator input. It is known that this kind of the dividing capacitors are prone to capture impulse noise propagating both the power bus, and air. In addition, in the known devices at the entrance of the SU, you may experience interference due to the asymmetry of the input RC and other chains. The asymmetry in the known amplifiers also leads to insufficient attenuation of common mode noise.

Increased reliability of the proposed amplifier reading is ensured by the fact that there is no input threshold voltage (as is the case in the known amplifier read). This is because if there spacestate and a wide range of temperatures may change the external threshold voltage that will result in either false positives comparator, or the disappearance of the output signal. In addition, increased reliability in the proposed device is ensured by the fact that bridged the pre-amplifier elements 8-15 are not critical to the supply voltage. This is due to the known property of the bridge being noncritical balanced bridge circuit to change the power. As in the amplifier when the supply voltage 24 V bridge rebalance the tion.

The proposed amplifier is read in comparison with the known is more than a simple device. There is no need to recover the DC component to the decoupling capacitor between the pre-amplifier and comparator, as is customary in the known amplifiers read. This is because in the proposed amplifier read there is no such coupling capacitor and, therefore, no need for the control signal. In addition, there is no need for the formation of such a signal in the structure of the controller.

Marked differences were the rst to provide long-term continuous operation of the law of Ukraine on CMD at elevated temperature (75aboutC).

The use of the proposed amplifier for reading a memory device the memory device on the CMD will enhance immunity, improve the reliability in terms of spacestate; to simplify storage device including a read amplifier.

A read amplifier for a memory device containing a first Zener diode, the anode of which is through the resistor connected to the cathode of the second Zener diode, the anode of which is connected to the outputs of the compensating and details Lucena to the anode of the first Zener diode and to the inputs of the first and second current generators, the outputs are connected to inputs of the compensating detector cylindrical magnetic domains and information detector cylindrical magnetic domains, respectively, the comparator output voltage is the output of the amplifier, characterized in that it introduced the third and fourth current generator and pre-amplifier is made on the first and second transistors, first and second load resistors, a variable resistor and the capacitor, and the base of the first transistor is connected to the input of the compensating detector cylindrical magnetic domains, the base of the second transistor is connected to the input information detector cylindrical magnetic domains, the output of the third current generator connected to the emitter of the first transistor and through a capacitor to the output of the fourth current generator and emitter of the second transistor, the collectors of which the first transistor through the first and second load resistors connected to the first and second findings of the variable resistor, the average output of which is connected to the bus power amplifier, the first and second inputs of the voltage comparator is connected respectively to the collectors of the first and second transistors, common bus amplifier connection is

 

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