SU1386913A1 - Digital stroboscopic converter of repetitive electric signals - Google Patents

Abstract

The invention can be used in digital oscilloscopes. Converter. Contains stroboscopic. cue mixer 1, strobe pulse shaper 2, 4 pulse shaper, generator 5, expander amplifier 7, AND 13 element, analog-to-digital converter 20, trigger t4, memory block 28 and counter 29. Introduction of elements 3, 12. and 15 delays, oscillator 6, comparators 8 and 9, stroboscopic mixer 10, formers 11 and 26 strobe pulses, triggers 16, 17 and 21, elements AND 18, 24 and 25, amplifier-expander 19, one-shot 22, elements OR 23 and 27 improves the accuracy of the conversion of unstable repetitive signals. 2 Il.

Description

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The invention relates to electrical measuring and pulse techniques and can be used in digital oscilloscopes.

The purpose of the invention is to improve the accuracy of converting unstable repeating signals.

FIG. 1 shows a block diagram of the device; in fig. 2 - time- | Q diagrams for the device operation.

Digital strobe transducer repeating electrical-. These signals contain a stroboscopic mixer 1, a shaper pulse shaper 2, a delay element 3, a shaper shaper 4, generators 5 and 6, a booster expander 7, comparators 8 and 9, a stroboscopic shaker 10, a strobe pulse shaper 11, a delay element 12, element 13, trigger 14, delay element 15, trigger 16, trigger 17, element 18, amplifier-expander 19, analog-to-digital converter (ADP) 20, trigger 21, one-shot 22, element OR 23, elements AND 24 and 25 shaper 26 pulses.

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The output of the stroboscopic converter OVATEL 1 is connected via the amplifier-expander 7 to the input of the A / D converter 20, the output of the first generator 5 is connected to the clock inputs of the trigger 16, the control input of the trigger 14 and the second input of the stroboscopic monitor 1O. The output of the delay element 12 is connected to the control input of the trigger 16, the output of which is connected to the third input of the element 18, the first and second inputs of which are connected to the outputs of the first 8 and second 9 comparators. Bus 32 Start is connected by the inputs of the initial installation of the triggers 14, 16 and 17 and the control input of the counter 29, the output of which is connected to the address input of the memory unit 28, the first control input of which is connected to the bus. O 34 Write-read and the first input of the AND element 13, the output of which is connected to the second inputs of the elements OR 23 and 27, the first input of the latter is connected to the output of the element AND 24, the second input of which is connected to the output of the first trigger 17, the clock input-which is connected

element OR 27, memory block 28, counting with trigger output 14, controlling

Chick 29, Bus Input 30, Installation 31, Start 32, Installation 33, Write / Read 34, Bus 35, the first reference voltage and Bus 36. the second reference voltage, bus 37 Output and bus 38 logical units.

The first input of the stroboscopic mixer 1 is connected to the bus 30 and the input through the pulse shaper 4 to the input of the delay element 12 and the first input of the stroboscopic mixer .10, the output of which through the amplifier-expander 19 is connected to the first inputs of the comparators 8 and 9, the second inputs of which are connected to the tires 35 and 36. Tires 31 and 33 Installation connected to the inputs of the generators 5 and 6, the output of the latter is connected to the first input element And 25, the second input element And 13, the first input

the inputs of the trigger 17 and 21 - with the bus 38 logical units. The output of trigger 2 is connected to the second input of the element AND 25, the output of which is connected through the one-shot 22 to the input of the initial installation of the trigger 21 and the first input of the element OR 23, the output of which through the pulse shaper 26 is connected to the second control input of the memory block 28. Triggers 16, 17, 14, and 21 can be configured as 1-triggers.

The converter works as follows.

At the initial moment of time, the impulse arriving on the 32 Start bus sets the triggers 14, 16 and 17 and the counter 29 in O. On the bus 34, the Record signal is set, on the tires 33 33 there are codes defining the periods T and

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element And 24, clock input trig-50 p ,,; pulse generators

Hera 14, through the delay element 3 and the strobe pulse shaper 2 with the second input of the stroboscopic mixer 1, as well as through the delay element 15 with the clock input of the ATP 20, 55 whose output is connected to the information input of the memory block 28, the output of which is connected to Bus 37 Exit,

5 and 6, respectively.

An input signal is applied to the inputs of the stroboscopic mixture of bodies 1 and shaper 4 pulses. At the output of the latter, a sequence of standard pulses is formed (Fig. 2a). Detuning of the periods following the pulse generators 5 (Fig. 26) and 6

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The output of the stroboscopic converter 1 is connected via amplifier-expander 7 to the input of the A / D converter 20, the output of the first generator 5 is connected to the clock inputs of the trigger 16, the control input of the trigger 14 and the second input of the stroboscopic mixer 1 O via the driver of the 11 trigger. The output of the delay element 12 is connected to the control input of the trigger 16, the output of which is connected to the third input of the element 18, the first and second inputs of which are connected to the outputs of the first 8 and second 9 comparators. Bus 32 Start is connected to the inputs of the initial installation of the flip-flops 14, 16 and 17 and the control input of the counter 29, the output of which is connected to the address input of the memory block 28, the first control input of which is connected to the bus. 34 Write-read and the first input of the element And 13, the output of which is connected to the second inputs of the elements OR 23 and 27, the first input of the latter is connected to the output of the element AND 24, the second input of which is connected to the output of the first trigger 17, the clock input-which is connected

o with trigger output 14, controlling

the inputs of the trigger 17 and 21 - with the bus 38 logical units. The output of the trigger 21 is connected to the second input of the element AND 25, the output of which is connected through the one-shot 22 to the input of the initial setup of the trigger 21 and the first input of the element OR 23, the output of which through the pulse shaper 26 is connected to the second control input of the memory block 28. Triggers 16, 17, 14, and 21 can be configured as 1-triggers.

The Converter operates as follows.

At the initial moment of time, the impulse arriving on the 32 Start bus establishes triggers 14, 16 and 17 and the counter 29 in O. On the bus 34, a Record signal is set, on buses 31 33 there are codes defining the periods T and

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0

0 p ,,; pulse generators

5 and 6, respectively.

An input signal is applied to the inputs of the stroboscopic mixer 1 and shaper 4 pulses. At the output of the latter, a sequence of standard pulses is formed (Fig. 2a). Detuning of the periods following the pulse generators 5 (Fig. 26) and 6

(Fig. 2c) is the price of dividing the time scale and is chosen to be equal to

the value of the sampling step of the input signal. For example, at T, 10, O and a given value of 4 T 100 ps, the period should be 10.1 not at K 1, 20.1 NS at K 2, etc., where T, and the periods of the pulses from the generators 5 and 6 respectively.

f The origin of the pulses of generator 5 and 6 is taken as the starting point. This moment is triggered by the triggers 14 and 17. After the match through the elements AND 24 and OR 27, the oscillator 6 pulses start to arrive at the counting input of the counter 29. Assigning the matched pulses of the number 0 to the next. The generator 6 is shifted in time relative to the next pulse of the generator 5 per liter T (FIG. 26, c). The second pulses of the generators 5 and 6 are shifted in time one relative to the other by 2LT (Fig. 26, c), etc. Thus, in the time interval between the coincidences of the pulses of the generators 5 and 6, the pulses of the generator 6 sample the period T with the step CT. a time scale of length T is formed, with the cost of dividing 4T. The scale number from its beginning, i.e. The number of the pulse of the generator 6 from the moment of coincidence of the pulses of the generators 5 and 6 is determined by the state of the A-counter 29, the outputs of which are connected to the address input of the 28-unit.

The sample is resolved by writing to memory block 28 on a pulse of generator 6, immediately following the coincidence of the pulses of the generator 5 and the driver 4 of pulses. Selecting this match makes it possible to synchronize the created time scale p by the input signal. The moment of coincidence is considered the point in time at which, according to the impulse of the generator 5, converted into a strobe-pulse by the converter 11, in the stroboscopic mixer 10b), the sample lies on a certain (front or rear) front of the pulse coming from the generator of 4 pulses and the amplitude value of U (A of the selected sample falls within the voltage range (Uo, UQ + 4U). Belonging to the sample for a certain front, the pulse causes the element

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12 delays and trigger 16. Fulfillment of conditions

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Comparators 8 and 9 are checked. At the time of analyzing the conditions (1) by comparators 8 and 9, the signal from the output of the strobe-mixer 10 is amplified and expanded by the amplifier-expander 19, i.e. the mixer 10, the converter 11 and the amplifier-expander 19 form a sampling-storage device. When condition (1) is fulfilled and a sample is taken at a given pulse front at the output of element 18, a signal is set that sets trigger 21 to 1, which opens element 25 and allows writing the sample to memory block 28 via the next generator pulse 6. A write pulse is formed by a pulse shaper 26, to which an oscillator 6 pulse passes through the OR 23 element, and an open element AND 25 passes through the rear edge of this pulse. The one-oscillator 22 turns on the trigger edge 21, which sets the trigger 21 into O.

If the pulse synchronous with the sequence signal, coming from the output of driver 5, coincided with A. - generator pulse 5, then the sample is taken according to the A импуль 2 pulse of the ipaTopa 6 gene shifted relative to A of the pulse of the generator 5 (Fig. 2b) and, accordingly, shifted by A; LT relative to the pulse of the former 4. Obviously, the address of the selected sample will be equal to A. Memory of the sample with different addresses, as a result, in block 28 of the memory, an array of N different samples (N 0 - block capacity 28) . The same samples would be obtained by sequential sampling of the input signal with an LT step in the time interval from the beginning of the signal to T.,.,.

When reading the crawled information on the bus 34, a read signal is set. In this case, the element AND 13 opens and, through it, the generator 6 pulses through the elements OR 23 and 27 begin to flow to the second control input of the memory unit 28 and to the counting input of the address counter 29, respectively. Generator 5 is off in read mode. Through N .. ,, shulsov generator 6 information

from block 28 it will be read and transmitted via tires 37, after which a new cycle of recording information about the waveform can be started,

Claims (1)

Invention Formula ; : Digital stroboscopic transducer of repetitive electrical signals 5 containing the first generator of the analog-digital converter, the first pulse driver, the memory unit, the first trigger, the first element I, the first strobe pulse generator -expander, bus Input Start and Output and the first stroboscopic mixer; the first input of which is connected to the Bxofl bus; its second input is connected to the output of the first strobe driver for the pulse5 and the output through the first amplifier-conn input with an analog-to-digital converter, the output of which is connected to the information input of the memory unit, so that, in order to increase the accuracy of the conversion of unstable | repetitive signals He additionally introduced two comparators 5 three delay elements, the second generator, the second stroboscopic mixer., the second amplifier-expander 5 the second strobe pulse shaper, the second pulse shaper 5 one-vibrator5 three triggers three elements AND, two elements OR, tires and tire Record schitshanie 5 s-bonded to the first WMOs :,, the house of the second element And the first control;;: equal to the input of the memory unit; the output of the iKOToporo is connected to the bus; the output of the bus is connected to the inputs of the first and second generators; the output of the last is connected to the first input of the first element And, the second input of the second element And the clock input of the second trigger and the first input of the third element And, as well as through the first delay element with the input of the first gate strobe pulses and through the second delay element - with the clock input Q 5 5 0 five 0 analog-digital converter, the input is connected through the first pulse generator with the input of the third delay element and the first input of the second stroboscopic (1 mixer, which code is connected via the second amplifier-expander to the first inputs of both comparators, the second inputs of which are connected to the first and second reference voltage cooTJBeTCTBeHHOj the output of the first (the generator is connected via the second driver-strobe pulses with the second input of the second stroboscopic mixer, clock input of the third trigger and control With the second trigger input, the output of the third delay element is connected to the control input of the third trigger, the initial setup input of which is connected to the same inputs of the first and second trigger, the control input of the counter and the Start bus, the output of the first comparator is connected to the first input the fourth element is And, the second input of which is connected to the output of the second comparator, the output of the third trigger is connected to the third input of the fourth element And, the output of which is connected to the clock input of the fourth trigger, whose output o is connected to the second input of the first element I, the output of which is connected through the one-shot to the input of the initial installation of the fourth trigger and the first input of the first element of the RSHI, the second input of which is connected to the output of the second element AND and the second input of the second element OR, whose output is connected to the counting input the counter, and its output is connected to the address input of the memory unit, the output of the second trigger is connected to the clock input of the first trigger, and its output is connected to the second input of the third And element, the output of which is connected to the first input element house OR output of the first "Hilti lementa .Through second pulse generator coupled to a second control input of the memory unit ti5 control inputs of the first and fourth Trigg-ditch connected together and to the bus logic unit.