SU911625A1 - Dynamic storage devicne - Google Patents

Description

(S) DYNAMIC RECORDING DEVICE

. . . ; THE INVENTION RELATES TO MEMORY: NATIONAL DEVICES.

: Dynamic memory devices are known which contain a switching capacitor, a storage capacitor and an operational amplifier tl.

The sampling time of the input voltage is determined by the constant time of the charging circuit of the storage circuit; pa — and, therefore, depends on the output impedance of the signal source. In addition, the storage time: the sampling is influenced not only by the input current of the operational amplifier, but also by the leakage current of the open key; .. . ; Closest to the present invention is a dynamic memory device consisting of an operational amplifier, the non-inverting input of which supplies the input signal of three switching keys, one of which is connected to the output of an operational amplifier by one contact,

and the second contact is with a storage capacitor, the second plate of which is connected to a point having zero potential, and to a gate of a field-effect transistor, the drain of which is connected to a power source, and the source through a resistor is connected to a power source of opposite polarity with a resistor is the point to which it is removed, the output voltage of the device, and, in addition, this point is connected to the contact of the second switching key, the second contact of which is connected to

15 by the inverting input of the operational amplifier and the contact of the third switching key, the second contact of which is connected to the output of the operational amplifier 2.

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A disadvantage of the known device is the low speed in certain areas of the input signal range. In addition, to the point 39

The storage of the sample is influenced not only by the input current of the field-effect transistor, but also by the leakage current of the switching key in the storage capacitor charge circuit.

The purpose of the invention is to increase the speed of the device and increase the accuracy of information storage.

The goal is achieved by the fact that in a dynamic memory device containing an operational amplifier, a memory element made on a capacitor, and keys, the output of the operational amplifier is connected by po inputs of the first and second keys, the inverting input is connected to the first and second switches, the output of which is the output of the device, one of the terminals of the capacitor is connected to the output of the second switch, and the other is connected to the zero potential bus, a current generator and a stabilization element are installed on the field TpaHSvicTope with a built-in channel, a drain, a gate, the source of which is connected respectively to the power bus, the output of the second switch, the input of the current generator and the output of the device.

If a requirement is imposed on the device, which is an increased accuracy of information storage, it is advisable to supplement it with fourth and fifth keys, with the fourth input and the fifth key output connected to the non-inverting input of the operational amplifier, the fourth key output is connected to the current generator input and the input of the fifth key is the device input.

The drawing shows a functional diagram of a dynamic storage device,

The device contains an operational amplifier 1, a memory element made, for example, on a capacitor 2, a stabilization element made on a field-effect transistor 3 with a built-in channel, current generator Q, first, 5 second 6, third 7i fourth 8 and nine 9 keys. The drain, gate, source of the transistor 3 are connected respectively to the power supply bus 10, the output of the switch 6 (the current generator input and the device output.

The input of the key 8 and the output of the key 9 are connected to a non-inverting input of the amplifier 1, the output of the key 8 is connected to

54

the input of the current generator i, and the input of the key 9 is the input of the device.

One of the terminals of the capacitor 2 is connected to the bus 11 of zero potential.

The device works as follows.

In the input voltage recording mode (i.e., when the keys 6.7 and E are closed and the keys 5 and 8 are open), the capacitor 2 is charged to a level at which the output voltage of the device is equal to the input.

Since the original field mode

the transistor 3 with the built-in channel for using the current generator k is set such that the voltage between the gate and the source of the transistor is zero, then the voltage on the capacitor 2 and the device output are equal.

In the fixed voltage storage mode (three., When the keys 6, 7 and, 9 are open, and the keys 5 and 8 are closed), the capacitor 2 is isolated from the output of the operational amplifier 1. Since the key 5 is in the storage mode, the operational amplifier is covered,} 00 consecutive negative

By reference to voltage, and to -: - -, a CIM is a non-inverting voltage follower. Then, in the sample storage mode, the output voltage of the operating

the amplifier is equal to its input voltage, which is the output voltage of the device coming through the closed key 8 equal to the voltage across the capacitor 2.

The proposed device allows to achieve high speed in the whole range of input signals and its value is almost independent of the power mode of the terminal stage.

Claims (2)

1. A dynamic memory device containing an operational amplifier., A memory element made on the capacitor, and a key, the output of the operational amplifier connected to the inputs of the first and second keys, the inverting input to the output of the first and the third key, the output of which is device output, one of the conclusions 9 The sensor is connected to the output of the second key, and the other to the zero potential bus, which, in order to increase the speed of the device, it contains a current generator and a stabilization element made on a field-effect transistor with an integrated channel, drain, gate, the source of which is connected respectively to the power bus, the output of the second key, the input of the current generator and the output of the device. 2. The device according to claim 1, of which it is, in order to improve the accuracy of information storage, it contains the fourth and fifth five . 6 keys, the fourth input and the output of the fifth key are connected to a non-inverting one, the input of the operational amplifier, the fourth key output is connected to the current generator input, and the fifth key input is the device input. Sources of information taken into account in the examination 1. Shilo V.L. Linear integrated circuits. M., Soviet Radio, 1979. p. 330. 2. Travelers B.C. The use of operational amplifiers in the measuring technology. L., Energie, 1975. p. 85 (prototype).