SU996989A1 - Time-to-code measuring converter - Google Patents

Description

The invention relates to a measurement technique and can be used in precision time-to-code converters.

Known vernier. a time converter is a code containing a recirculation generator, consisting of four gates, two delay elements, a coincidence circuit, a trigger, and a counter P.

The disadvantages of this converter are the limitation of the maximum duration of the measured interval by the length of the recirculation generator period and that the resolution and stability of the time scale are determined by the frequency stability of the recirculation generators.

Closest to the technical essence of the invention is a time converter - a code containing gp conversion stages, connected in series, each of which has a delay element, a coincidence circuit, a mismatch scheme, and a trigger {. .

However, this is a prbrahbra: a calling harp (hteri: wats with live action, low K:) L TCiinof Tivio and, by way of time, convert the interval m

 , with given accuracy

i g 1 O

5 where TO is the quantization step, tp is the number of conversion stages.

The purpose of the invention is to expand the range of convertible intervals, as well as to increase the accuracy and speed of the converter.

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The goal is achieved by the fact that the time transducer is a code containing t serially connected pulse formers, the information output of each of which is connected to the input of the corresponding counter discharge, the elements AND, H – NO, NOT and the additional counter are entered, and the input the converter is connected to the first input of the element I, the second input of which is connected to the output of the element and the input of the additional counter, and the output to the input of the first pulse shaper, the output

25 of the last pulse generator is connected to the first input of the element i; -HE directly and through an Mii-HT Ht; - with BTopi.iiM input element I-NC.

In addition to the TOGS1, the importer 30 contains an element AND, element-e-Devices and a comparison element, the input of the driver connected to the first and inputs of the elements AND, delay and comparison, the output of the latter is the information output of the pulse former, the output of the delay element is connected to the second input of the element AND , the direct output of which is the output of the pulse former, and the inverse output of the And element is connected to the second input of the comparison element.

FIG. 1 is a block diagram of a time converter code; in fig. 2 is a voltage chart of a converter.

Time transducer - the code contains m 1.1-1.t pulse drivers, each of which has a delay element 2, element 3 AND, and element 4 comparison, element 5 NOT, element 6 AND-NOT, counter 7, additional counter 8 and element 9 AND

The Converter operates as follows.

The measured pulse arrives at the input of element 9 I, the other input of which receives the level of logical unit 1 from the output of element b – NES, destroying the passage of the measured impulse to the input of the first generator 1.1, which separates a part of the measured interval of duration l T from the leading edge of the measured pulse, the duration of the interval being selected is specified by delay element 2, a pulse is formed on elements 3 and 4, and this one. The selected interval comes from the information output of the former 1.1, to the input of the counter 7. The shortened-by interval d T measured pulse is the output of the former to the input of the second former 1.2, shortened again by dT and the process is repeated. If the last pulse of the first shaper 1, t pulses is received by a pulse shortened in the previous shapers for a duration (t − 1) lt, but exceeding the interval of duration dT, then the measured pulse from its second output is shortened by the same shaper the leading edge selects at the output of element 6 AND-NOT a short pulse by a level of logic O with a duration equal to the duration of the delay Cj of element 5 NOT. This pulse arrives at the input of element 9 I and prohibits the passage of measured pulse through element 9 I for time Tj. After time Tj from the moment of prohibition, the leading edge of the measured pulse interrupted intermittently re-enters the input of the first driver 1.1, and the process of measuring pulse repeats is. The additional counter 8 counts the number of prohibition pulses to improve the measurement accuracy.

The measured impulse, duration e t, is equal to t NaT +, where N is the reading of the counter 7, NK is the reading of the counter 8.

FIG. 2 shows the following signals: a - at the first input of element 9 I, - b - at the second input of element 9 I; in - at the output of the element 9 And; r at the inverse output of element 3 I; d - at the direct output of element 3 And, e - at the output of the first driver 1.1 pulses; x is the output of the second pulse former 1.2.

As delay elements, radio cable segments can be used, which makes it possible to adjust the time values. These elements are delayed by changing the geometric length of the cable segments in order to change the quantization step.

Claims (2)

1. Measuring time transducer - a code containing pp of serially connected pulse shapers, information output - each of which is connected to the input. corresponding discharge counter, characterized in that, in order to expand the range of convertible intervals, as well as improve the accuracy and speed of the converter, elements and, AND-NOT, NOT and an additional counter, are inserted into it, the converter input being connected to the first input, element And, the second input of which is connected to the output of the NAND element and the input of the additional counter, and the output to the input of the first impulse generator, the output of the last impulse generator is connected to the first input of the NAND element directly and through the element NOT to the second input of the AND element -NOT. 2. The converter according to claim 1, characterized in that the pulse driver contains an AND element, a delay element and a comparison element, the input of the driver is connected to the first inputs of the elements: AND, delay and comparison, the output of the latter is an information output of the pulse former, the output the delay element is connected to the second input of the element I, the direct output of which is the output of the pulse shaper, and the inverse output of the element is connected to the second input of the comparison element. Sources of information taken into account in the examination 1. Meleshko E.D. Integrated circuits in nuclear electronics. Atomizdat 1977, p. 149. 2. Gitis E.I. Information converters for electronic, digital computing devices. Energy 1970, p. 213.