SU773732A1 - Analogue storage - Google Patents

Description

one

The invention relates to analog computing and can be used in analog information processing devices, automation devices, measuring and computing equipment.

An analog memory element l is known. the disadvantage of which is low speed.

The closest to the technical essence of the present invention is an analog memory block containing serially connected comparison circuit, an error amplifier, a memory element with non-destructive reading of information and a reader, as well as a non-linear fustoshonal converter. In this case, the first input of the comparison circuit is the input of the analog memory block, the second input is connected to the output of the reader, the third input is connected to the output of the nonlinear function converter, the input of which is connected to the output

an error amplifier, wherein the output of the reader is an output of an analog memory block, having an improved speed of 2j,

A disadvantage of the known device is the complexity of setting up a non-linear functional converter, which reduces the stability and reliability of operation.

The purpose of the invention is to increase the reliability and stability of the device.

The goal is achieved by the fact that in an analog storage device containing serially connected comparison unit, an error amplifier, a storage element, a reading unit, a nonlinear function converter, the first input of the comparison unit being the device input, the second input is connected to the output of the reading unit, the output of which is the output of the device, the input of the non-linear functional converter is connected to the first

15 of the comparator unit, and the output is connected to the input of the error amplifier.

FIG. 1 shows a block diagram of the device; in fig. 2a shows the write-read characteristics of three different non-destructive readable memory elements in FIG. 26 - the required characteristics of the nonlinear functional converter. The device contains, block 1 comparison, 10 error amplifier 2, nonlinear functional. the transducer 3, the storage element 4, the reading unit 5. The device works as follows. When a certain value of an input analog value, that needs to be memorized with a given accuracy, is received, nondestructive reading of information from storage element 4 is first carried out to determine its state, which at a given time can be arbitrary, depending on the analog information | previously recorded in it, and the readout analog value Xgiji B is fixed by block 5 of the readout for the turn off time of the readout signal and turn on the write signal. The need for fixation is due to the inadmissibility of simultaneous effects of the write and read signals for existing storage elements, because the interplay of these signals, for example, in magnetic storage elements, or because the write and read signals are sent to the same circuit for example in the storage elements on MNOS transistors. Thus, the write and read cycles are spaced apart in time. Suppose, for definiteness, that the state of the storage element corresponds to the zero value of the input analogue value X 0 of the zeshisannoy B it earlier. Let error amplifier 2 have a gain equal to unity. One of the main requirements for analog storage devices is the linear dependence of the writeable input X. ,, and the readable output of Chl. analog values, and in most cases the equality of these values X, Xg is required, which graphically reflects line A (Fig. 2a). Imagine that in the device there is no non-linear functional pre-

Brazator 3. In this case, the comparison unit 1 compares the values of the input analog value, and the output analog value X ", O, and selects

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the error signal lx, determined by their difference, i.e. . -X ", which & t f

an error is given to the input of amplifier 2, having a gain factor of one. Therefore, the output signal. The 15-20 error amplifier 2-X, which is the recording signal for the storage element 4, is equal to the value of the input analog value Xgj, i.e. X, X. Writing this value in memorizing element 4, which has a nonlinear write-read characteristic (curve B in Fig. 2a), leads to the fact that upon further reading of information, reading unit 5 generates an output analog value equal to X, significantly different from the recorded value X. If we use a nonlinear functional converter 3, which, under the action of the input signal X-, will generate such a signal X. that the output signal of the amplifier 2, the error ЗП1 tfli ° ® records this signal to the memory element. 4g, upon further reading of the information, the readout block 5 generates the value of the output analog value, equal to X-, which coincides with the values of the input, ie, X,. (Hd. Considered principle of operation of the device. It is valid for any values of the analog input value X "in the I5X range of its variation. The characteristic of the nonlinear front-to-analog converter 3 (Fig. 26) can be obtained graphically when setting different values of Xg, plot the x the read / write actions of the storage elements 4 (Fig. 2a), or by an analytical method as follows: The write-read characteristic of the storage element 4 can be1 / recorded analytically, as a non-linear relationship (X). If Xgi is taken as the independent variable, and X is taken as the dependent variable, then the dependence, y (X. |), reflects the inverse write-read characteristic. With this in mind, the characteristic of the nonlinear functional converter 3 is determined by the difference of the inverse characteristic write-read memory element 4 and the input value, i.e.

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G,. where X is the output signal / al nonlinear A. - OUTPUT signal Fp

functional converter 3.

If the state of the Meitri-a 4 storage element is not zero, then X.S.O and this value must be taken into account when analyzing the operation of the device, which remains the same. Moreover, the type of characteristic of the nonlinear functional converter 3 does not depend on the initial state of the storage element 4. In the case of an ideal setting, it is non-linear. Neutral function converter 3 and error amplifier 2 for recording the value of the input analog value X. It takes only one cycle of the device, consisting of one nondestructive read cycle and one record of information in the storage element 4, and the recording time does not change when writing X-values of different levels.

Due to the impossibility of perfecting the nonlinear functional transformer 3 and amplifier 2 wrongly, due to possible deviations of the circuit parameters during operation, after the first cycle of the device, the error signal X reappears, to reduce which to the required level several more cycles of operation of the device . At the same time, the total number of device operation cycles, which determines its speed, is determined by the accuracy of setting up the device nodes and the required recording accuracy of the analog output X,

In contrast to the known, the proposed device does not form a loop of local feedback, which can cause self-oscillations.

or the output of blocks entering this circuit into saturation mode. Therefore, the dynamic properties of the nonlinear functional converter, the comparator unit and the error amplifier are not very demanding, there is no need to take measures to ensure the stability of the operation, which simplifies the configuration of the device and improves its stability and reliability.

IS

Claims (2)

1. Japanese Patent No. 44-12983, cl. 97 (8) 1, 1969. 2. Author's certificate of the USSR according to the application M "2576368 / 18-24, cl. G 11 C 27 / OO, 1978 (prototype). Ssii. . Cshu} ifH2} 4uitl3) a % sn () XyjZi2) From „g (5)