SU1711234A2 - Analog memory tester - Google Patents

Abstract

The invention relates to a measurement technique, can be used to measure the parameters of analog memories. device and is an improvement of the device according to A. Kb T635223, The purpose of the invention is to expand the functionality of the meter by measuring the sampling time of a known storage device. Postz c: Lenna goal is achieved by introducing a multiplexer, a second one-way switch, an RS flip-flop, an adjustable source of reference voltage. The device makes it possible to measure, in addition to the aperture time of the CAM, the sampling time of the CAM. At the same time, for measuring, the meter is not required to be connected to the storage capacitor АЗУ, which distinguishes the proposed meter from the known ones. 2 Il.

Description

The invention relates to a measurement technique, can be used to measure the parameters of analog recording devices, and is an improvement on the meter according to the author. No. 1635223.

The purpose of the invention is to expand the functionality of the meter by measuring the sampling time of an analog storage device.

Figure 1 shows the functional diagram of the meter; figure 2 - timing charts.

The meter contains a pulse generator 1, a frequency divider 2, a reference differential driver 3, a differential amplifier-limiter 4, an oscilloscope 5, element 6, the first 7 and second 8 delay elements 9 and 10 forming a fast and slowly varying sawtooth voltage the switch 11, the first 12 and the second 13 one-shot, the multiplexer 14, the RS flip-flop 15 and the adjustable source 16 of the reference voltage. In addition, the diagram (Fig. 1) shows the measured analog storage device (ABC) 17, information input 18 of ACU 17, input .19 of operation mode control and output 20, as well as meter output 21 for connecting information input 18 of АЗУ, the first 22 and second 23 outputs of the meter for connection to the input 19 of the control of the operating mode of the ABC and input 24 of the meter for connecting the output 20 of the ABC.

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The time diagram of the meter, shown in Figure 2 a-k, shows the signals at the outputs of the following meter blocks in order of their enumeration: 1.2.3, 7, 9 and 10, 15, 16, 20, 6.

The meter parameters of the analog storage device works as follows.

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. When connecting the input 19 of the control of the mode of the measured CCD .17 to the output 22 of the meter, the aperture time of the CCD is measured. If the ABC mode control input 19 is connected to the meter output 23, then the ACC sampling time is measured. In this case, the clock pulses with a frequency FT from the pulse generator 1 (Fig. 2a) are fed to a frequency divider 2, from the output of which a square wave is fed to the driver 3 of the reference differential (Fig. 26) with a frequency FT / 2. Simultaneously the pulses from the output Oscillator 1 is fed to the input of delay element 7, consisting, for example, of two series-connected single-oscillators. From the output of the delay element 7, the pulses (Fig. 2d), delayed by the HUFEP time t, where ty Fap is the time for setting the voltage at the output of the shaper 3 of the reference differential, are fed to the inputs of the one-shot 13, the fast saw formation unit 9, the slow saw setting unit 10 and to the S input of the trigger 15, the transfer to the last one state. When the voltages at the outputs of blocks 9 and 10 (fig. 2e) are equal, switch 11 generates a voltage drop, which generates a pulse at the output of the one-oscillator 12. The pulse from the single-vibrator 12 is fed to the R input of the trigger 15 and brings it to the zero state . Thus, at the output of the trigger 15, pulses of variable duration are formed (Fig. 2g).

The minimum duration of these pulses TV min is chosen less than the estimated sampling time of the tested AMS, and the maximum duration TV max is obviously longer than the sample time of the AMS, and the minimum duration TV min is determined by the pulse duration at the output of the element, 7 delay, and the maximum TV max is the sum of durations pulses at the outputs of blocks 7 and 9. Multiplexer -14 passes to the input control of the mode of operation of the ABC alternately pulses with a linearly increasing duration from the output of the RS flip-flop 15 and pulses nominal ny duration from the output of the one-shot (fig.2zh).

As a result, at the output of the tested CAM for the first half of the period of operation of the divider 2, the minimum voltage is recorded at the output of the driver 3. And for the second half of the period, a pulse with a varying duration — recording

the maximum value, although at the minimum pulse duration of the sample the transient process of recording does not have time to end (Fig. 2i). Recorded in the second

5, half of the period of the voltage value from the output of the CCD is fed through the limiting amplifier 4 to the input of the vertical deflection of the oscilloscope 5 and highlighted with a pulse taken from the output

0 of the element 6 and (Fig. 2k). For the horizontal deflection of the beam of the oscilloscope 5, the voltage from the output of the shaping unit 10, which slowly changes the saw-tooth voltage, is used. At the same time, on the screen of the oscilloscope 5 one can see the curve of the transition section of the storage capacitor of the storage capacitor in the examined AMU 17 when the sample time changes from Tv min. before tv max. Point on this

The 0 curve, which differs from the steady-state value by the value of the maximum permissible error of writing of the CCD, corresponds to the measured sampling time of the CCD. (Thus, the proposed meter makes it possible to measure, in addition to the aperture time, the AMS, and the sampling time of the AMS. In this case, the meter does not need to be connected to the storage capacitor of the AMU, which favorably distinguishes.

0 proposed meter from the famous. Formula of the invention. An analog parameter meter is memorized, e, g, and device according to auth. No. 1635223, characterized in that

In order to extend the functionality by measuring the sampling time of an analog storage device, a multiplexer, a second one-shot, an RS flip-flop and an adjustable reference voltage source, the output of which is connected to the inverter, are entered into it. to the input of the differential limiting amplifier; the reset input of the RS flip-flop is connected to the output of the first

5 one-shot, setting input to one state - to the output of the first delay element and the input of the second one-shot, the output of which is connected to the first information input of the multiplexer,

0 the second information input of which is connected to the output RSrTpnrrepa, the control input to the output of the frequency divider, and the output is the second output of the meter for connecting the control input of the operating mode of the analog storage device.

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Claims (1)

BACKGROUND OF THE INVENTION An analogue storage parameter meter of the device according to Auth., No. 1635223, characterized in that, with the aim of expanding functionality by measuring the sampling time of the analogue storage device, a multiplexer, a second one-shot, RS-flip-flop and 40 adjustable reference voltage source, the output of which is connected to the inverting one. the differential amplifier-limiter input, the RS-reset input to the zero state is connected to the output of the first 45 single-vibrator, the unit input to the single state is connected to the output of the first delay element and the input of the second single-vibrator, the output of which is connected to the first information input of the multiplexer, .50 the second information the input of which is connected to the output of RSrTpnrrepa, the control input is with the output of the frequency divider, and the output is the second output of the meter for connecting the control input of the analogue mode device. . When connecting the input 19 of the control mode of the measured AZU 17 to the output 22 of the meter, the aperture time of the AZU is measured. If the input 19 of the control mode of the AZU is connected to the output 23 5 of the meter, then the measurement of the sampling time of the AZU. In this case, clock pulses with a frequency of F _T from the pulse generator 1 (Fig. 2a) are fed to a frequency divider 2, from the output of which a meander (Fig. 26) with a frequency of F _T / 2 is fed to the shaper 3 of the reference differential. Simultaneously with this, the pulses from the output of the generator 1 are fed to the input of the delay element 7, consisting, for example, of two 15 single-vibrators connected in series. From the output of the delay element 7, pulses (Fig. 2d), delayed by the time τι> r _U Fep. where ty fep is the time of establishing the voltage at the output of the shaper 3 of the reference rep 20, arrive at the inputs of the single-vibrator 13 * of the fast saw forming unit 9, the slow saw forming unit 10 and at the S-input of the trigger 15, translating the latter into a single state. If the voltage is equal to 25 at the outputs of blocks 9 and 10 (Fig.2d), the switch 11 generates a voltage drop that generates a pulse at the output of the one-shot 12. The pulse from the one-shot 12 is fed to the R-input of the trigger 30 15 and puts it in the zero state. Thus, at the output of the trigger 15, pulses of variable duration are formed (Fig.2zh). The minimum duration of these T pulses _per minute is chosen to be shorter than the expected sampling time of the tested AZU. and the maximum duration T _in max is obviously longer than the time of sampling of the RAM, and the minimum duration Tw min 40 is determined by the duration of the pulse at the output of the element, 7 delays, and the maximum T _{in the} maximum sum of durations of pulses at the outputs of blocks 7 and 9. The multiplexer -14 passes to the input control the operating mode 45 of the AZU alternately pulses with ramp duration from the output of the RS-flip-flop 15 and pulses of a nominal duration from the output of a single-shot (Fig.2zh). .fifty As a result, at the output of the tested AZU for the first half of the period of operation of the divider 2, the minimum voltage at the output of the shaper 3 is recorded. and for the second half of the period, an impulse with 55 varying durations - record 5 1711234 6 Fi g j οι PAYAT_L__G1_A] _P_ - + A GA DARKNESS